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Finding the Fourth Proportional to 40.15, 55.38 and 29.21

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Solution

The fourth proportional to 40.15, 55.38 and 29.21 is: 40.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.15 : 55.38 = 29.21 : x
  2. Step 2: Convert to fraction form
    40.15/55.38 = 29.21/x
  3. Step 3: Cross multiply
    40.15x = 55.38 × 29.21
  4. Step 4: Simplify right side
    40.15x = 1,617.65
  5. Step 5: Solve for x
    x = 1,617.65/40.15
  6. Step 6: Final answer
    x = 40.29

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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.