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Finding the Fourth Proportional to 79.68, 119.49 and 21.89

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Solution

The fourth proportional to 79.68, 119.49 and 21.89 is: 32.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.68 : 119.49 = 21.89 : x
  2. Step 2: Convert to fraction form
    79.68/119.49 = 21.89/x
  3. Step 3: Cross multiply
    79.68x = 119.49 × 21.89
  4. Step 4: Simplify right side
    79.68x = 2,615.28
  5. Step 5: Solve for x
    x = 2,615.28/79.68
  6. Step 6: Final answer
    x = 32.82

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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.