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Finding the Fourth Proportional to 39.89, 59.88 and 28.49

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Solution

The fourth proportional to 39.89, 59.88 and 28.49 is: 42.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.89 : 59.88 = 28.49 : x
  2. Step 2: Convert to fraction form
    39.89/59.88 = 28.49/x
  3. Step 3: Cross multiply
    39.89x = 59.88 × 28.49
  4. Step 4: Simplify right side
    39.89x = 1,705.98
  5. Step 5: Solve for x
    x = 1,705.98/39.89
  6. Step 6: Final answer
    x = 42.77

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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.