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Finding the Fourth Proportional to 77.19, 115.71 and 64.44

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Solution

The fourth proportional to 77.19, 115.71 and 64.44 is: 96.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.19 : 115.71 = 64.44 : x
  2. Step 2: Convert to fraction form
    77.19/115.71 = 64.44/x
  3. Step 3: Cross multiply
    77.19x = 115.71 × 64.44
  4. Step 4: Simplify right side
    77.19x = 7,456.35
  5. Step 5: Solve for x
    x = 7,456.35/77.19
  6. Step 6: Final answer
    x = 96.60

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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.