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Finding the Fourth Proportional to 40.98, 56.37 and 39.90

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Solution

The fourth proportional to 40.98, 56.37 and 39.90 is: 54.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.98 : 56.37 = 39.90 : x
  2. Step 2: Convert to fraction form
    40.98/56.37 = 39.90/x
  3. Step 3: Cross multiply
    40.98x = 56.37 × 39.90
  4. Step 4: Simplify right side
    40.98x = 2,249.16
  5. Step 5: Solve for x
    x = 2,249.16/40.98
  6. Step 6: Final answer
    x = 54.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.