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Finding the Fourth Proportional to 42.23, 63.39 and 28.70

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Solution

The fourth proportional to 42.23, 63.39 and 28.70 is: 43.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.23 : 63.39 = 28.70 : x
  2. Step 2: Convert to fraction form
    42.23/63.39 = 28.70/x
  3. Step 3: Cross multiply
    42.23x = 63.39 × 28.70
  4. Step 4: Simplify right side
    42.23x = 1,819.29
  5. Step 5: Solve for x
    x = 1,819.29/42.23
  6. Step 6: Final answer
    x = 43.08

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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.