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Finding the Fourth Proportional to 29.30, 40.42 and 28.29

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Solution

The fourth proportional to 29.30, 40.42 and 28.29 is: 39.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.30 : 40.42 = 28.29 : x
  2. Step 2: Convert to fraction form
    29.30/40.42 = 28.29/x
  3. Step 3: Cross multiply
    29.30x = 40.42 × 28.29
  4. Step 4: Simplify right side
    29.30x = 1,143.41
  5. Step 5: Solve for x
    x = 1,143.41/29.30
  6. Step 6: Final answer
    x = 39.02

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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.