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Finding the Fourth Proportional to 100.89, 151.29 and 90.84

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Solution

The fourth proportional to 100.89, 151.29 and 90.84 is: 136.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.89 : 151.29 = 90.84 : x
  2. Step 2: Convert to fraction form
    100.89/151.29 = 90.84/x
  3. Step 3: Cross multiply
    100.89x = 151.29 × 90.84
  4. Step 4: Simplify right side
    100.89x = 13,743.18
  5. Step 5: Solve for x
    x = 13,743.18/100.89
  6. Step 6: Final answer
    x = 136.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.