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Finding the Fourth Proportional to 79.60, 119.90 and 71.14

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Solution

The fourth proportional to 79.60, 119.90 and 71.14 is: 107.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.60 : 119.90 = 71.14 : x
  2. Step 2: Convert to fraction form
    79.60/119.90 = 71.14/x
  3. Step 3: Cross multiply
    79.60x = 119.90 × 71.14
  4. Step 4: Simplify right side
    79.60x = 8,528.73
  5. Step 5: Solve for x
    x = 8,528.73/79.60
  6. Step 6: Final answer
    x = 107.15

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.