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Finding the Fourth Proportional to 261,639.31, 392,468.54 and 72,114.81

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Solution

The fourth proportional to 261,639.31, 392,468.54 and 72,114.81 is: 108,174.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,639.31 : 392,468.54 = 72,114.81 : x
  2. Step 2: Convert to fraction form
    261,639.31/392,468.54 = 72,114.81/x
  3. Step 3: Cross multiply
    261,639.31x = 392,468.54 × 72,114.81
  4. Step 4: Simplify right side
    261,639.31x = 28,302,794,193.08
  5. Step 5: Solve for x
    x = 28,302,794,193.08/261,639.31
  6. Step 6: Final answer
    x = 108,174.85

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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.