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Finding the Fourth Proportional to 129,915.88, 194,935.76 and 89,996.40

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Solution

The fourth proportional to 129,915.88, 194,935.76 and 89,996.40 is: 135,037.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,915.88 : 194,935.76 = 89,996.40 : x
  2. Step 2: Convert to fraction form
    129,915.88/194,935.76 = 89,996.40/x
  3. Step 3: Cross multiply
    129,915.88x = 194,935.76 × 89,996.40
  4. Step 4: Simplify right side
    129,915.88x = 17,543,516,631.26
  5. Step 5: Solve for x
    x = 17,543,516,631.26/129,915.88
  6. Step 6: Final answer
    x = 135,037.51

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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.