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Finding the Fourth Proportional to 42.50, 63.78 and 18.46

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Solution

The fourth proportional to 42.50, 63.78 and 18.46 is: 27.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.50 : 63.78 = 18.46 : x
  2. Step 2: Convert to fraction form
    42.50/63.78 = 18.46/x
  3. Step 3: Cross multiply
    42.50x = 63.78 × 18.46
  4. Step 4: Simplify right side
    42.50x = 1,177.38
  5. Step 5: Solve for x
    x = 1,177.38/42.50
  6. Step 6: Final answer
    x = 27.70

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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.