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Finding the Third Proportional to 39.47 and 58.78

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Solution

The third proportional to 39.47 and 58.78 is: 87.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.47 : 58.78 = 58.78 : x
  2. Step 2: Convert to fraction form
    39.47/58.78 = 58.78/x
  3. Step 3: Cross multiply
    39.47x = 58.78 × 58.78
  4. Step 4: Simplify right side
    39.47x = 3,455.24
  5. Step 5: Solve for x
    x = 3,455.24/39.47
  6. Step 6: Final answer
    x = 87.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.