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Finding the Fourth Proportional to 106.79, 159.91 and 77.84

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Solution

The fourth proportional to 106.79, 159.91 and 77.84 is: 116.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.79 : 159.91 = 77.84 : x
  2. Step 2: Convert to fraction form
    106.79/159.91 = 77.84/x
  3. Step 3: Cross multiply
    106.79x = 159.91 × 77.84
  4. Step 4: Simplify right side
    106.79x = 12,446.40
  5. Step 5: Solve for x
    x = 12,446.40/106.79
  6. Step 6: Final answer
    x = 116.55

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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.