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Finding the Fourth Proportional to 42.92, 64.28 and 42.04

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Solution

The fourth proportional to 42.92, 64.28 and 42.04 is: 62.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.92 : 64.28 = 42.04 : x
  2. Step 2: Convert to fraction form
    42.92/64.28 = 42.04/x
  3. Step 3: Cross multiply
    42.92x = 64.28 × 42.04
  4. Step 4: Simplify right side
    42.92x = 2,702.33
  5. Step 5: Solve for x
    x = 2,702.33/42.92
  6. Step 6: Final answer
    x = 62.96

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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.