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Finding the Fourth Proportional to 128,186.68, 176,747.57 and 87,374.97

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Solution

The fourth proportional to 128,186.68, 176,747.57 and 87,374.97 is: 120,475.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,186.68 : 176,747.57 = 87,374.97 : x
  2. Step 2: Convert to fraction form
    128,186.68/176,747.57 = 87,374.97/x
  3. Step 3: Cross multiply
    128,186.68x = 176,747.57 × 87,374.97
  4. Step 4: Simplify right side
    128,186.68x = 15,443,313,626.32
  5. Step 5: Solve for x
    x = 15,443,313,626.32/128,186.68
  6. Step 6: Final answer
    x = 120,475.18

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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.