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Finding the Fourth Proportional to 518,986.40, 778,479.60 and 253,265.90

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Solution

The fourth proportional to 518,986.40, 778,479.60 and 253,265.90 is: 379,898.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,986.40 : 778,479.60 = 253,265.90 : x
  2. Step 2: Convert to fraction form
    518,986.40/778,479.60 = 253,265.90/x
  3. Step 3: Cross multiply
    518,986.40x = 778,479.60 × 253,265.90
  4. Step 4: Simplify right side
    518,986.40x = 197,162,336,525.64
  5. Step 5: Solve for x
    x = 197,162,336,525.64/518,986.40
  6. Step 6: Final answer
    x = 379,898.85

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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.