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Finding the Fourth Proportional to 129,680.61, 178,955.68 and 72,321.68

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Solution

The fourth proportional to 129,680.61, 178,955.68 and 72,321.68 is: 99,801.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,680.61 : 178,955.68 = 72,321.68 : x
  2. Step 2: Convert to fraction form
    129,680.61/178,955.68 = 72,321.68/x
  3. Step 3: Cross multiply
    129,680.61x = 178,955.68 × 72,321.68
  4. Step 4: Simplify right side
    129,680.61x = 12,942,374,975.75
  5. Step 5: Solve for x
    x = 12,942,374,975.75/129,680.61
  6. Step 6: Final answer
    x = 99,801.93

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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.