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Finding the Fourth Proportional to 90.26, 135.18 and 54.20

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Solution

The fourth proportional to 90.26, 135.18 and 54.20 is: 81.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.26 : 135.18 = 54.20 : x
  2. Step 2: Convert to fraction form
    90.26/135.18 = 54.20/x
  3. Step 3: Cross multiply
    90.26x = 135.18 × 54.20
  4. Step 4: Simplify right side
    90.26x = 7,326.76
  5. Step 5: Solve for x
    x = 7,326.76/90.26
  6. Step 6: Final answer
    x = 81.17

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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.