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Finding the Fourth Proportional to 90.26, 135.28 and 42.06

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Solution

The fourth proportional to 90.26, 135.28 and 42.06 is: 63.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.26 : 135.28 = 42.06 : x
  2. Step 2: Convert to fraction form
    90.26/135.28 = 42.06/x
  3. Step 3: Cross multiply
    90.26x = 135.28 × 42.06
  4. Step 4: Simplify right side
    90.26x = 5,689.88
  5. Step 5: Solve for x
    x = 5,689.88/90.26
  6. Step 6: Final answer
    x = 63.04

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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.