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Finding the Fourth Proportional to 129,287.68, 178,410.48 and 72,695.68

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Solution

The fourth proportional to 129,287.68, 178,410.48 and 72,695.68 is: 100,316.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,287.68 : 178,410.48 = 72,695.68 : x
  2. Step 2: Convert to fraction form
    129,287.68/178,410.48 = 72,695.68/x
  3. Step 3: Cross multiply
    129,287.68x = 178,410.48 × 72,695.68
  4. Step 4: Simplify right side
    129,287.68x = 12,969,671,162.73
  5. Step 5: Solve for x
    x = 12,969,671,162.73/129,287.68
  6. Step 6: Final answer
    x = 100,316.37

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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.