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Finding the Fourth Proportional to 39.80, 59.41 and 39.47

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Solution

The fourth proportional to 39.80, 59.41 and 39.47 is: 58.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.80 : 59.41 = 39.47 : x
  2. Step 2: Convert to fraction form
    39.80/59.41 = 39.47/x
  3. Step 3: Cross multiply
    39.80x = 59.41 × 39.47
  4. Step 4: Simplify right side
    39.80x = 2,344.66
  5. Step 5: Solve for x
    x = 2,344.66/39.80
  6. Step 6: Final answer
    x = 58.91

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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.