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Finding the Fourth Proportional to 39.89, 59.76 and 38.18

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Solution

The fourth proportional to 39.89, 59.76 and 38.18 is: 57.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.89 : 59.76 = 38.18 : x
  2. Step 2: Convert to fraction form
    39.89/59.76 = 38.18/x
  3. Step 3: Cross multiply
    39.89x = 59.76 × 38.18
  4. Step 4: Simplify right side
    39.89x = 2,281.79
  5. Step 5: Solve for x
    x = 2,281.79/39.89
  6. Step 6: Final answer
    x = 57.20

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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.