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Finding the Fourth Proportional to 40.23, 55.58 and 38.21

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Solution

The fourth proportional to 40.23, 55.58 and 38.21 is: 52.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.23 : 55.58 = 38.21 : x
  2. Step 2: Convert to fraction form
    40.23/55.58 = 38.21/x
  3. Step 3: Cross multiply
    40.23x = 55.58 × 38.21
  4. Step 4: Simplify right side
    40.23x = 2,123.24
  5. Step 5: Solve for x
    x = 2,123.24/40.23
  6. Step 6: Final answer
    x = 52.78

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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.