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Finding the Fourth Proportional to 520,084.80, 780,127.20 and 342,937.80

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Solution

The fourth proportional to 520,084.80, 780,127.20 and 342,937.80 is: 514,406.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,084.80 : 780,127.20 = 342,937.80 : x
  2. Step 2: Convert to fraction form
    520,084.80/780,127.20 = 342,937.80/x
  3. Step 3: Cross multiply
    520,084.80x = 780,127.20 × 342,937.80
  4. Step 4: Simplify right side
    520,084.80x = 267,535,105,688.16
  5. Step 5: Solve for x
    x = 267,535,105,688.16/520,084.80
  6. Step 6: Final answer
    x = 514,406.70

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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.