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Finding the Fourth Proportional to 90.19, 135.07 and 74.90

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Solution

The fourth proportional to 90.19, 135.07 and 74.90 is: 112.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.19 : 135.07 = 74.90 : x
  2. Step 2: Convert to fraction form
    90.19/135.07 = 74.90/x
  3. Step 3: Cross multiply
    90.19x = 135.07 × 74.90
  4. Step 4: Simplify right side
    90.19x = 10,116.89
  5. Step 5: Solve for x
    x = 10,116.89/90.19
  6. Step 6: Final answer
    x = 112.17

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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.