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Finding the Fourth Proportional to 151.07, 208.42 and 98.68

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Solution

The fourth proportional to 151.07, 208.42 and 98.68 is: 136.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.07 : 208.42 = 98.68 : x
  2. Step 2: Convert to fraction form
    151.07/208.42 = 98.68/x
  3. Step 3: Cross multiply
    151.07x = 208.42 × 98.68
  4. Step 4: Simplify right side
    151.07x = 20,565.35
  5. Step 5: Solve for x
    x = 20,565.35/151.07
  6. Step 6: Final answer
    x = 136.13

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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.