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Finding the Fourth Proportional to 90.75, 136.23 and 54.24

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Solution

The fourth proportional to 90.75, 136.23 and 54.24 is: 81.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.75 : 136.23 = 54.24 : x
  2. Step 2: Convert to fraction form
    90.75/136.23 = 54.24/x
  3. Step 3: Cross multiply
    90.75x = 136.23 × 54.24
  4. Step 4: Simplify right side
    90.75x = 7,389.12
  5. Step 5: Solve for x
    x = 7,389.12/90.75
  6. Step 6: Final answer
    x = 81.42

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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.