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Finding the Fourth Proportional to 42.92, 64.41 and 20.11

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Solution

The fourth proportional to 42.92, 64.41 and 20.11 is: 30.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.92 : 64.41 = 20.11 : x
  2. Step 2: Convert to fraction form
    42.92/64.41 = 20.11/x
  3. Step 3: Cross multiply
    42.92x = 64.41 × 20.11
  4. Step 4: Simplify right side
    42.92x = 1,295.12
  5. Step 5: Solve for x
    x = 1,295.12/42.92
  6. Step 6: Final answer
    x = 30.17

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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.