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Finding the Fourth Proportional to 151.38, 208.87 and 89.20

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Solution

The fourth proportional to 151.38, 208.87 and 89.20 is: 123.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.38 : 208.87 = 89.20 : x
  2. Step 2: Convert to fraction form
    151.38/208.87 = 89.20/x
  3. Step 3: Cross multiply
    151.38x = 208.87 × 89.20
  4. Step 4: Simplify right side
    151.38x = 18,631.20
  5. Step 5: Solve for x
    x = 18,631.20/151.38
  6. Step 6: Final answer
    x = 123.08

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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.