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Finding the Fourth Proportional to 79.78, 119.70 and 63.84

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Solution

The fourth proportional to 79.78, 119.70 and 63.84 is: 95.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.78 : 119.70 = 63.84 : x
  2. Step 2: Convert to fraction form
    79.78/119.70 = 63.84/x
  3. Step 3: Cross multiply
    79.78x = 119.70 × 63.84
  4. Step 4: Simplify right side
    79.78x = 7,641.65
  5. Step 5: Solve for x
    x = 7,641.65/79.78
  6. Step 6: Final answer
    x = 95.78

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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.