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Finding the Fourth Proportional to 39.89, 60.20 and 39.48

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Solution

The fourth proportional to 39.89, 60.20 and 39.48 is: 59.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.89 : 60.20 = 39.48 : x
  2. Step 2: Convert to fraction form
    39.89/60.20 = 39.48/x
  3. Step 3: Cross multiply
    39.89x = 60.20 × 39.48
  4. Step 4: Simplify right side
    39.89x = 2,376.50
  5. Step 5: Solve for x
    x = 2,376.50/39.89
  6. Step 6: Final answer
    x = 59.58

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.