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Finding the Fourth Proportional to 29.87, 41.18 and 28.43

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Solution

The fourth proportional to 29.87, 41.18 and 28.43 is: 39.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.87 : 41.18 = 28.43 : x
  2. Step 2: Convert to fraction form
    29.87/41.18 = 28.43/x
  3. Step 3: Cross multiply
    29.87x = 41.18 × 28.43
  4. Step 4: Simplify right side
    29.87x = 1,170.40
  5. Step 5: Solve for x
    x = 1,170.40/29.87
  6. Step 6: Final answer
    x = 39.19

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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.