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Finding the Fourth Proportional to 29.30, 43.55 and 28.76

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Solution

The fourth proportional to 29.30, 43.55 and 28.76 is: 42.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    29.30 : 43.55 = 28.76 : x
  2. Step 2: Convert to fraction form
    29.30/43.55 = 28.76/x
  3. Step 3: Cross multiply
    29.30x = 43.55 × 28.76
  4. Step 4: Simplify right side
    29.30x = 1,252.73
  5. Step 5: Solve for x
    x = 1,252.73/29.30
  6. Step 6: Final answer
    x = 42.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.