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Finding the Fourth Proportional to 29.10, 40.15 and 21.85

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Solution

The fourth proportional to 29.10, 40.15 and 21.85 is: 30.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.10 : 40.15 = 21.85 : x
  2. Step 2: Convert to fraction form
    29.10/40.15 = 21.85/x
  3. Step 3: Cross multiply
    29.10x = 40.15 × 21.85
  4. Step 4: Simplify right side
    29.10x = 877.28
  5. Step 5: Solve for x
    x = 877.28/29.10
  6. Step 6: Final answer
    x = 30.15

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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.