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Finding the Fourth Proportional to 28.17, 42 and 23.85

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Solution

The fourth proportional to 28.17, 42 and 23.85 is: 35.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28.17 : 42 = 23.85 : x
  2. Step 2: Convert to fraction form
    28.17/42 = 23.85/x
  3. Step 3: Cross multiply
    28.17x = 42 × 23.85
  4. Step 4: Simplify right side
    28.17x = 1,001.70
  5. Step 5: Solve for x
    x = 1,001.70/28.17
  6. Step 6: Final answer
    x = 35.56

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1.5x scale

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.