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Finding the Fourth Proportional to 151.54, 208.89 and 123.87

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Solution

The fourth proportional to 151.54, 208.89 and 123.87 is: 170.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.54 : 208.89 = 123.87 : x
  2. Step 2: Convert to fraction form
    151.54/208.89 = 123.87/x
  3. Step 3: Cross multiply
    151.54x = 208.89 × 123.87
  4. Step 4: Simplify right side
    151.54x = 25,875.20
  5. Step 5: Solve for x
    x = 25,875.20/151.54
  6. Step 6: Final answer
    x = 170.75

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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.