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Finding the Fourth Proportional to 39.82, 59.79 and 21.79

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Solution

The fourth proportional to 39.82, 59.79 and 21.79 is: 32.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.82 : 59.79 = 21.79 : x
  2. Step 2: Convert to fraction form
    39.82/59.79 = 21.79/x
  3. Step 3: Cross multiply
    39.82x = 59.79 × 21.79
  4. Step 4: Simplify right side
    39.82x = 1,302.82
  5. Step 5: Solve for x
    x = 1,302.82/39.82
  6. Step 6: Final answer
    x = 32.72

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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.