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Finding the Fourth Proportional to 40.38, 56.10 and 39.77

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Solution

The fourth proportional to 40.38, 56.10 and 39.77 is: 55.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.38 : 56.10 = 39.77 : x
  2. Step 2: Convert to fraction form
    40.38/56.10 = 39.77/x
  3. Step 3: Cross multiply
    40.38x = 56.10 × 39.77
  4. Step 4: Simplify right side
    40.38x = 2,230.82
  5. Step 5: Solve for x
    x = 2,230.82/40.38
  6. Step 6: Final answer
    x = 55.25

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.