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Finding the Fourth Proportional to 42.22, 58.21 and 39.92

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Solution

The fourth proportional to 42.22, 58.21 and 39.92 is: 55.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.22 : 58.21 = 39.92 : x
  2. Step 2: Convert to fraction form
    42.22/58.21 = 39.92/x
  3. Step 3: Cross multiply
    42.22x = 58.21 × 39.92
  4. Step 4: Simplify right side
    42.22x = 2,323.74
  5. Step 5: Solve for x
    x = 2,323.74/42.22
  6. Step 6: Final answer
    x = 55.04

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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.