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Finding the Fourth Proportional to 74.29, 111.40 and 28.61

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Solution

The fourth proportional to 74.29, 111.40 and 28.61 is: 42.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.29 : 111.40 = 28.61 : x
  2. Step 2: Convert to fraction form
    74.29/111.40 = 28.61/x
  3. Step 3: Cross multiply
    74.29x = 111.40 × 28.61
  4. Step 4: Simplify right side
    74.29x = 3,187.15
  5. Step 5: Solve for x
    x = 3,187.15/74.29
  6. Step 6: Final answer
    x = 42.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.