Home / 129,171.39-178,182.20-80,689.04

Finding the Fourth Proportional to 129,171.39, 178,182.20 and 80,689.04

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Solution

The fourth proportional to 129,171.39, 178,182.20 and 80,689.04 is: 111,304.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,171.39 : 178,182.20 = 80,689.04 : x
  2. Step 2: Convert to fraction form
    129,171.39/178,182.20 = 80,689.04/x
  3. Step 3: Cross multiply
    129,171.39x = 178,182.20 × 80,689.04
  4. Step 4: Simplify right side
    129,171.39x = 14,377,349,973.90
  5. Step 5: Solve for x
    x = 14,377,349,973.90/129,171.39
  6. Step 6: Final answer
    x = 111,304.45

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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.