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Finding the Fourth Proportional to 79.42, 119.36 and 77.70

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Solution

The fourth proportional to 79.42, 119.36 and 77.70 is: 116.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.42 : 119.36 = 77.70 : x
  2. Step 2: Convert to fraction form
    79.42/119.36 = 77.70/x
  3. Step 3: Cross multiply
    79.42x = 119.36 × 77.70
  4. Step 4: Simplify right side
    79.42x = 9,274.27
  5. Step 5: Solve for x
    x = 9,274.27/79.42
  6. Step 6: Final answer
    x = 116.78

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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.