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Finding the Fourth Proportional to 39.43, 59.12 and 20.18

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Solution

The fourth proportional to 39.43, 59.12 and 20.18 is: 30.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.43 : 59.12 = 20.18 : x
  2. Step 2: Convert to fraction form
    39.43/59.12 = 20.18/x
  3. Step 3: Cross multiply
    39.43x = 59.12 × 20.18
  4. Step 4: Simplify right side
    39.43x = 1,192.94
  5. Step 5: Solve for x
    x = 1,192.94/39.43
  6. Step 6: Final answer
    x = 30.26

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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.