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Finding the Fourth Proportional to 90, 135.18 and 74.79

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Solution

The fourth proportional to 90, 135.18 and 74.79 is: 112.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    90 : 135.18 = 74.79 : x
  2. Step 2: Convert to fraction form
    90/135.18 = 74.79/x
  3. Step 3: Cross multiply
    90x = 135.18 × 74.79
  4. Step 4: Simplify right side
    90x = 10,110.11
  5. Step 5: Solve for x
    x = 10,110.11/90
  6. Step 6: Final answer
    x = 112.33

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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.