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Finding the Fourth Proportional to 77.96, 116.91 and 39.49

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Solution

The fourth proportional to 77.96, 116.91 and 39.49 is: 59.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.96 : 116.91 = 39.49 : x
  2. Step 2: Convert to fraction form
    77.96/116.91 = 39.49/x
  3. Step 3: Cross multiply
    77.96x = 116.91 × 39.49
  4. Step 4: Simplify right side
    77.96x = 4,616.48
  5. Step 5: Solve for x
    x = 4,616.48/77.96
  6. Step 6: Final answer
    x = 59.21

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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.