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Finding the Fourth Proportional to 79.48, 119.28 and 28.13

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Solution

The fourth proportional to 79.48, 119.28 and 28.13 is: 42.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.48 : 119.28 = 28.13 : x
  2. Step 2: Convert to fraction form
    79.48/119.28 = 28.13/x
  3. Step 3: Cross multiply
    79.48x = 119.28 × 28.13
  4. Step 4: Simplify right side
    79.48x = 3,354.94
  5. Step 5: Solve for x
    x = 3,354.94/79.48
  6. Step 6: Final answer
    x = 42.21

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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.