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Finding the Fourth Proportional to 39.89, 59.72 and 34.79

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Solution

The fourth proportional to 39.89, 59.72 and 34.79 is: 52.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.89 : 59.72 = 34.79 : x
  2. Step 2: Convert to fraction form
    39.89/59.72 = 34.79/x
  3. Step 3: Cross multiply
    39.89x = 59.72 × 34.79
  4. Step 4: Simplify right side
    39.89x = 2,077.19
  5. Step 5: Solve for x
    x = 2,077.19/39.89
  6. Step 6: Final answer
    x = 52.08

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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.