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Finding the Fourth Proportional to 39.98, 54.68 and 39.35

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Solution

The fourth proportional to 39.98, 54.68 and 39.35 is: 53.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.98 : 54.68 = 39.35 : x
  2. Step 2: Convert to fraction form
    39.98/54.68 = 39.35/x
  3. Step 3: Cross multiply
    39.98x = 54.68 × 39.35
  4. Step 4: Simplify right side
    39.98x = 2,151.66
  5. Step 5: Solve for x
    x = 2,151.66/39.98
  6. Step 6: Final answer
    x = 53.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.