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Finding the Fourth Proportional to 90.80, 135.96 and 58.64

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Solution

The fourth proportional to 90.80, 135.96 and 58.64 is: 87.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.80 : 135.96 = 58.64 : x
  2. Step 2: Convert to fraction form
    90.80/135.96 = 58.64/x
  3. Step 3: Cross multiply
    90.80x = 135.96 × 58.64
  4. Step 4: Simplify right side
    90.80x = 7,972.69
  5. Step 5: Solve for x
    x = 7,972.69/90.80
  6. Step 6: Final answer
    x = 87.81

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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.