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Finding the Fourth Proportional to 77.19, 106.79 and 63.35

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Solution

The fourth proportional to 77.19, 106.79 and 63.35 is: 87.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.19 : 106.79 = 63.35 : x
  2. Step 2: Convert to fraction form
    77.19/106.79 = 63.35/x
  3. Step 3: Cross multiply
    77.19x = 106.79 × 63.35
  4. Step 4: Simplify right side
    77.19x = 6,764.30
  5. Step 5: Solve for x
    x = 6,764.30/77.19
  6. Step 6: Final answer
    x = 87.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.