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Finding the Fourth Proportional to 90.29, 135.53 and 42.23

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Solution

The fourth proportional to 90.29, 135.53 and 42.23 is: 63.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.29 : 135.53 = 42.23 : x
  2. Step 2: Convert to fraction form
    90.29/135.53 = 42.23/x
  3. Step 3: Cross multiply
    90.29x = 135.53 × 42.23
  4. Step 4: Simplify right side
    90.29x = 5,723.43
  5. Step 5: Solve for x
    x = 5,723.43/90.29
  6. Step 6: Final answer
    x = 63.39

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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.