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Finding the Fourth Proportional to 79.79, 119.95 and 71.28

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Solution

The fourth proportional to 79.79, 119.95 and 71.28 is: 107.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.79 : 119.95 = 71.28 : x
  2. Step 2: Convert to fraction form
    79.79/119.95 = 71.28/x
  3. Step 3: Cross multiply
    79.79x = 119.95 × 71.28
  4. Step 4: Simplify right side
    79.79x = 8,549.86
  5. Step 5: Solve for x
    x = 8,549.86/79.79
  6. Step 6: Final answer
    x = 107.16

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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.