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Finding the Fourth Proportional to 77.39, 116.66 and 76.31

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Solution

The fourth proportional to 77.39, 116.66 and 76.31 is: 115.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.39 : 116.66 = 76.31 : x
  2. Step 2: Convert to fraction form
    77.39/116.66 = 76.31/x
  3. Step 3: Cross multiply
    77.39x = 116.66 × 76.31
  4. Step 4: Simplify right side
    77.39x = 8,902.32
  5. Step 5: Solve for x
    x = 8,902.32/77.39
  6. Step 6: Final answer
    x = 115.03

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.