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Finding the Fourth Proportional to 90.82, 136.03 and 71.52

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Solution

The fourth proportional to 90.82, 136.03 and 71.52 is: 107.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.82 : 136.03 = 71.52 : x
  2. Step 2: Convert to fraction form
    90.82/136.03 = 71.52/x
  3. Step 3: Cross multiply
    90.82x = 136.03 × 71.52
  4. Step 4: Simplify right side
    90.82x = 9,728.87
  5. Step 5: Solve for x
    x = 9,728.87/90.82
  6. Step 6: Final answer
    x = 107.12

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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.