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Finding the Fourth Proportional to 90.80, 136.21 and 58.33

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Solution

The fourth proportional to 90.80, 136.21 and 58.33 is: 87.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.80 : 136.21 = 58.33 : x
  2. Step 2: Convert to fraction form
    90.80/136.21 = 58.33/x
  3. Step 3: Cross multiply
    90.80x = 136.21 × 58.33
  4. Step 4: Simplify right side
    90.80x = 7,944.75
  5. Step 5: Solve for x
    x = 7,944.75/90.80
  6. Step 6: Final answer
    x = 87.50

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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.