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Finding the Fourth Proportional to 90.60, 135.94 and 66.74

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Solution

The fourth proportional to 90.60, 135.94 and 66.74 is: 100.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.60 : 135.94 = 66.74 : x
  2. Step 2: Convert to fraction form
    90.60/135.94 = 66.74/x
  3. Step 3: Cross multiply
    90.60x = 135.94 × 66.74
  4. Step 4: Simplify right side
    90.60x = 9,072.64
  5. Step 5: Solve for x
    x = 9,072.64/90.60
  6. Step 6: Final answer
    x = 100.14

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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.