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Finding the Fourth Proportional to 79.71, 119.01 and 68.88

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Solution

The fourth proportional to 79.71, 119.01 and 68.88 is: 102.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.71 : 119.01 = 68.88 : x
  2. Step 2: Convert to fraction form
    79.71/119.01 = 68.88/x
  3. Step 3: Cross multiply
    79.71x = 119.01 × 68.88
  4. Step 4: Simplify right side
    79.71x = 8,197.41
  5. Step 5: Solve for x
    x = 8,197.41/79.71
  6. Step 6: Final answer
    x = 102.84

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.