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Finding the Fourth Proportional to 231.80, 347.72 and 77.81

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Solution

The fourth proportional to 231.80, 347.72 and 77.81 is: 116.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.80 : 347.72 = 77.81 : x
  2. Step 2: Convert to fraction form
    231.80/347.72 = 77.81/x
  3. Step 3: Cross multiply
    231.80x = 347.72 × 77.81
  4. Step 4: Simplify right side
    231.80x = 27,053.97
  5. Step 5: Solve for x
    x = 27,053.97/231.80
  6. Step 6: Final answer
    x = 116.72

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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.