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Finding the Fourth Proportional to 79.78, 119.59 and 39.11

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Solution

The fourth proportional to 79.78, 119.59 and 39.11 is: 58.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.78 : 119.59 = 39.11 : x
  2. Step 2: Convert to fraction form
    79.78/119.59 = 39.11/x
  3. Step 3: Cross multiply
    79.78x = 119.59 × 39.11
  4. Step 4: Simplify right side
    79.78x = 4,677.16
  5. Step 5: Solve for x
    x = 4,677.16/79.78
  6. Step 6: Final answer
    x = 58.63

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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.