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Finding the Fourth Proportional to 40.18, 55.47 and 36.31

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Solution

The fourth proportional to 40.18, 55.47 and 36.31 is: 50.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.18 : 55.47 = 36.31 : x
  2. Step 2: Convert to fraction form
    40.18/55.47 = 36.31/x
  3. Step 3: Cross multiply
    40.18x = 55.47 × 36.31
  4. Step 4: Simplify right side
    40.18x = 2,014.12
  5. Step 5: Solve for x
    x = 2,014.12/40.18
  6. Step 6: Final answer
    x = 50.13

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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.