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Finding the Fourth Proportional to 151.70, 227.43 and 86.69

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Solution

The fourth proportional to 151.70, 227.43 and 86.69 is: 129.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.70 : 227.43 = 86.69 : x
  2. Step 2: Convert to fraction form
    151.70/227.43 = 86.69/x
  3. Step 3: Cross multiply
    151.70x = 227.43 × 86.69
  4. Step 4: Simplify right side
    151.70x = 19,714.77
  5. Step 5: Solve for x
    x = 19,714.77/151.70
  6. Step 6: Final answer
    x = 129.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.