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Finding the Fourth Proportional to 77.55, 116.37 and 77.31

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Solution

The fourth proportional to 77.55, 116.37 and 77.31 is: 116.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.55 : 116.37 = 77.31 : x
  2. Step 2: Convert to fraction form
    77.55/116.37 = 77.31/x
  3. Step 3: Cross multiply
    77.55x = 116.37 × 77.31
  4. Step 4: Simplify right side
    77.55x = 8,996.56
  5. Step 5: Solve for x
    x = 8,996.56/77.55
  6. Step 6: Final answer
    x = 116.01

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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.