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Finding the Fourth Proportional to 42.18, 58.29 and 31.85

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Solution

The fourth proportional to 42.18, 58.29 and 31.85 is: 44.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.18 : 58.29 = 31.85 : x
  2. Step 2: Convert to fraction form
    42.18/58.29 = 31.85/x
  3. Step 3: Cross multiply
    42.18x = 58.29 × 31.85
  4. Step 4: Simplify right side
    42.18x = 1,856.54
  5. Step 5: Solve for x
    x = 1,856.54/42.18
  6. Step 6: Final answer
    x = 44.01

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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.