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Finding the Fourth Proportional to 42.33, 63.46 and 21.79

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Solution

The fourth proportional to 42.33, 63.46 and 21.79 is: 32.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.33 : 63.46 = 21.79 : x
  2. Step 2: Convert to fraction form
    42.33/63.46 = 21.79/x
  3. Step 3: Cross multiply
    42.33x = 63.46 × 21.79
  4. Step 4: Simplify right side
    42.33x = 1,382.79
  5. Step 5: Solve for x
    x = 1,382.79/42.33
  6. Step 6: Final answer
    x = 32.67

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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.