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Finding the Fourth Proportional to 74.64, 112.12 and 38.56

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Solution

The fourth proportional to 74.64, 112.12 and 38.56 is: 57.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.64 : 112.12 = 38.56 : x
  2. Step 2: Convert to fraction form
    74.64/112.12 = 38.56/x
  3. Step 3: Cross multiply
    74.64x = 112.12 × 38.56
  4. Step 4: Simplify right side
    74.64x = 4,323.35
  5. Step 5: Solve for x
    x = 4,323.35/74.64
  6. Step 6: Final answer
    x = 57.92

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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.