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Finding the Fourth Proportional to 90.75, 136.15 and 29.88

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Solution

The fourth proportional to 90.75, 136.15 and 29.88 is: 44.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.75 : 136.15 = 29.88 : x
  2. Step 2: Convert to fraction form
    90.75/136.15 = 29.88/x
  3. Step 3: Cross multiply
    90.75x = 136.15 × 29.88
  4. Step 4: Simplify right side
    90.75x = 4,068.16
  5. Step 5: Solve for x
    x = 4,068.16/90.75
  6. Step 6: Final answer
    x = 44.83

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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.