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Finding the Fourth Proportional to 74.64, 103.11 and 66.42

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Solution

The fourth proportional to 74.64, 103.11 and 66.42 is: 91.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.64 : 103.11 = 66.42 : x
  2. Step 2: Convert to fraction form
    74.64/103.11 = 66.42/x
  3. Step 3: Cross multiply
    74.64x = 103.11 × 66.42
  4. Step 4: Simplify right side
    74.64x = 6,848.57
  5. Step 5: Solve for x
    x = 6,848.57/74.64
  6. Step 6: Final answer
    x = 91.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.