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Finding the Fourth Proportional to 261,956.40, 392,934.60 and 156,721.20

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Solution

The fourth proportional to 261,956.40, 392,934.60 and 156,721.20 is: 235,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,956.40 : 392,934.60 = 156,721.20 : x
  2. Step 2: Convert to fraction form
    261,956.40/392,934.60 = 156,721.20/x
  3. Step 3: Cross multiply
    261,956.40x = 392,934.60 × 156,721.20
  4. Step 4: Simplify right side
    261,956.40x = 61,581,182,033.52
  5. Step 5: Solve for x
    x = 61,581,182,033.52/261,956.40
  6. Step 6: Final answer
    x = 235,081.80

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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.