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Finding the Fourth Proportional to 77.74, 116.52 and 69.64

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Solution

The fourth proportional to 77.74, 116.52 and 69.64 is: 104.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.74 : 116.52 = 69.64 : x
  2. Step 2: Convert to fraction form
    77.74/116.52 = 69.64/x
  3. Step 3: Cross multiply
    77.74x = 116.52 × 69.64
  4. Step 4: Simplify right side
    77.74x = 8,114.45
  5. Step 5: Solve for x
    x = 8,114.45/77.74
  6. Step 6: Final answer
    x = 104.38

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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.