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Finding the Fourth Proportional to 129,681, 179,107.40 and 87,165.72

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Solution

The fourth proportional to 129,681, 179,107.40 and 87,165.72 is: 120,387.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,681 : 179,107.40 = 87,165.72 : x
  2. Step 2: Convert to fraction form
    129,681/179,107.40 = 87,165.72/x
  3. Step 3: Cross multiply
    129,681x = 179,107.40 × 87,165.72
  4. Step 4: Simplify right side
    129,681x = 15,612,025,696.24
  5. Step 5: Solve for x
    x = 15,612,025,696.24/129,681
  6. Step 6: Final answer
    x = 120,387.92

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1.5x scale

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.