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Finding the Fourth Proportional to 129,510.63, 178,721.97 and 72,149.88

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Solution

The fourth proportional to 129,510.63, 178,721.97 and 72,149.88 is: 99,565.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,510.63 : 178,721.97 = 72,149.88 : x
  2. Step 2: Convert to fraction form
    129,510.63/178,721.97 = 72,149.88/x
  3. Step 3: Cross multiply
    129,510.63x = 178,721.97 × 72,149.88
  4. Step 4: Simplify right side
    129,510.63x = 12,894,768,688.86
  5. Step 5: Solve for x
    x = 12,894,768,688.86/129,510.63
  6. Step 6: Final answer
    x = 99,565.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.