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Finding the Fourth Proportional to 124.39, 185.90 and 90.21

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Solution

The fourth proportional to 124.39, 185.90 and 90.21 is: 134.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.39 : 185.90 = 90.21 : x
  2. Step 2: Convert to fraction form
    124.39/185.90 = 90.21/x
  3. Step 3: Cross multiply
    124.39x = 185.90 × 90.21
  4. Step 4: Simplify right side
    124.39x = 16,770.29
  5. Step 5: Solve for x
    x = 16,770.29/124.39
  6. Step 6: Final answer
    x = 134.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.