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Finding the Fourth Proportional to 151.61, 208.91 and 99.09

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Solution

The fourth proportional to 151.61, 208.91 and 99.09 is: 136.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.61 : 208.91 = 99.09 : x
  2. Step 2: Convert to fraction form
    151.61/208.91 = 99.09/x
  3. Step 3: Cross multiply
    151.61x = 208.91 × 99.09
  4. Step 4: Simplify right side
    151.61x = 20,701.14
  5. Step 5: Solve for x
    x = 20,701.14/151.61
  6. Step 6: Final answer
    x = 136.55

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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.