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Finding the Fourth Proportional to 74.92, 103.38 and 42.18

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Solution

The fourth proportional to 74.92, 103.38 and 42.18 is: 58.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.92 : 103.38 = 42.18 : x
  2. Step 2: Convert to fraction form
    74.92/103.38 = 42.18/x
  3. Step 3: Cross multiply
    74.92x = 103.38 × 42.18
  4. Step 4: Simplify right side
    74.92x = 4,360.57
  5. Step 5: Solve for x
    x = 4,360.57/74.92
  6. Step 6: Final answer
    x = 58.20

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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.