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Finding the Fourth Proportional to 129,261.84, 178,397.28 and 72,672

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Solution

The fourth proportional to 129,261.84, 178,397.28 and 72,672 is: 100,296.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,261.84 : 178,397.28 = 72,672 : x
  2. Step 2: Convert to fraction form
    129,261.84/178,397.28 = 72,672/x
  3. Step 3: Cross multiply
    129,261.84x = 178,397.28 × 72,672
  4. Step 4: Simplify right side
    129,261.84x = 12,964,487,132.16
  5. Step 5: Solve for x
    x = 12,964,487,132.16/129,261.84
  6. Step 6: Final answer
    x = 100,296.32

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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.