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Finding the Fourth Proportional to 151.74, 228 and 87.66

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Solution

The fourth proportional to 151.74, 228 and 87.66 is: 131.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.74 : 228 = 87.66 : x
  2. Step 2: Convert to fraction form
    151.74/228 = 87.66/x
  3. Step 3: Cross multiply
    151.74x = 228 × 87.66
  4. Step 4: Simplify right side
    151.74x = 19,986.48
  5. Step 5: Solve for x
    x = 19,986.48/151.74
  6. Step 6: Final answer
    x = 131.72

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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.