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Finding the Fourth Proportional to 77.79, 116.61 and 43.56

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Solution

The fourth proportional to 77.79, 116.61 and 43.56 is: 65.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.79 : 116.61 = 43.56 : x
  2. Step 2: Convert to fraction form
    77.79/116.61 = 43.56/x
  3. Step 3: Cross multiply
    77.79x = 116.61 × 43.56
  4. Step 4: Simplify right side
    77.79x = 5,079.82
  5. Step 5: Solve for x
    x = 5,079.82/77.79
  6. Step 6: Final answer
    x = 65.31

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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.