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Finding the Fourth Proportional to 518,987.40, 778,481.10 and 253,266.90

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Solution

The fourth proportional to 518,987.40, 778,481.10 and 253,266.90 is: 379,900.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,987.40 : 778,481.10 = 253,266.90 : x
  2. Step 2: Convert to fraction form
    518,987.40/778,481.10 = 253,266.90/x
  3. Step 3: Cross multiply
    518,987.40x = 778,481.10 × 253,266.90
  4. Step 4: Simplify right side
    518,987.40x = 197,163,494,905.59
  5. Step 5: Solve for x
    x = 197,163,494,905.59/518,987.40
  6. Step 6: Final answer
    x = 379,900.35

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.