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Finding the Fourth Proportional to 129,645.88, 178,960.52 and 87,229.01

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Solution

The fourth proportional to 129,645.88, 178,960.52 and 87,229.01 is: 120,409.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,645.88 : 178,960.52 = 87,229.01 : x
  2. Step 2: Convert to fraction form
    129,645.88/178,960.52 = 87,229.01/x
  3. Step 3: Cross multiply
    129,645.88x = 178,960.52 × 87,229.01
  4. Step 4: Simplify right side
    129,645.88x = 15,610,548,988.69
  5. Step 5: Solve for x
    x = 15,610,548,988.69/129,645.88
  6. Step 6: Final answer
    x = 120,409.14

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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.