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Finding the Fourth Proportional to 519,940.60, 779,910.90 and 431,294.20

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Solution

The fourth proportional to 519,940.60, 779,910.90 and 431,294.20 is: 646,941.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,940.60 : 779,910.90 = 431,294.20 : x
  2. Step 2: Convert to fraction form
    519,940.60/779,910.90 = 431,294.20/x
  3. Step 3: Cross multiply
    519,940.60x = 779,910.90 × 431,294.20
  4. Step 4: Simplify right side
    519,940.60x = 336,371,047,686.78
  5. Step 5: Solve for x
    x = 336,371,047,686.78/519,940.60
  6. Step 6: Final answer
    x = 646,941.30

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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.