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Finding the Fourth Proportional to 60.74, 91.12 and 20.16

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Solution

The fourth proportional to 60.74, 91.12 and 20.16 is: 30.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.74 : 91.12 = 20.16 : x
  2. Step 2: Convert to fraction form
    60.74/91.12 = 20.16/x
  3. Step 3: Cross multiply
    60.74x = 91.12 × 20.16
  4. Step 4: Simplify right side
    60.74x = 1,836.98
  5. Step 5: Solve for x
    x = 1,836.98/60.74
  6. Step 6: Final answer
    x = 30.24

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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.