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Finding the Fourth Proportional to 129,171.89, 178,182.89 and 80,689.54

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Solution

The fourth proportional to 129,171.89, 178,182.89 and 80,689.54 is: 111,305.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,171.89 : 178,182.89 = 80,689.54 : x
  2. Step 2: Convert to fraction form
    129,171.89/178,182.89 = 80,689.54/x
  3. Step 3: Cross multiply
    129,171.89x = 178,182.89 × 80,689.54
  4. Step 4: Simplify right side
    129,171.89x = 14,377,494,539.06
  5. Step 5: Solve for x
    x = 14,377,494,539.06/129,171.89
  6. Step 6: Final answer
    x = 111,305.13

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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.