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Finding the Fourth Proportional to 40.28, 55.49 and 38.16

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Solution

The fourth proportional to 40.28, 55.49 and 38.16 is: 52.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.28 : 55.49 = 38.16 : x
  2. Step 2: Convert to fraction form
    40.28/55.49 = 38.16/x
  3. Step 3: Cross multiply
    40.28x = 55.49 × 38.16
  4. Step 4: Simplify right side
    40.28x = 2,117.31
  5. Step 5: Solve for x
    x = 2,117.31/40.28
  6. Step 6: Final answer
    x = 52.57

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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.