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Finding the Fourth Proportional to 151.66, 208.38 and 123.96

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Solution

The fourth proportional to 151.66, 208.38 and 123.96 is: 170.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.66 : 208.38 = 123.96 : x
  2. Step 2: Convert to fraction form
    151.66/208.38 = 123.96/x
  3. Step 3: Cross multiply
    151.66x = 208.38 × 123.96
  4. Step 4: Simplify right side
    151.66x = 25,830.78
  5. Step 5: Solve for x
    x = 25,830.78/151.66
  6. Step 6: Final answer
    x = 170.32

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.