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Finding the Fourth Proportional to 519,207.40, 778,811.10 and 318,878.20

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Solution

The fourth proportional to 519,207.40, 778,811.10 and 318,878.20 is: 478,317.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,207.40 : 778,811.10 = 318,878.20 : x
  2. Step 2: Convert to fraction form
    519,207.40/778,811.10 = 318,878.20/x
  3. Step 3: Cross multiply
    519,207.40x = 778,811.10 × 318,878.20
  4. Step 4: Simplify right side
    519,207.40x = 248,345,881,708.02
  5. Step 5: Solve for x
    x = 248,345,881,708.02/519,207.40
  6. Step 6: Final answer
    x = 478,317.30

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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.