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Finding the Fourth Proportional to 231.79, 347.65 and 77.71

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Solution

The fourth proportional to 231.79, 347.65 and 77.71 is: 116.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.79 : 347.65 = 77.71 : x
  2. Step 2: Convert to fraction form
    231.79/347.65 = 77.71/x
  3. Step 3: Cross multiply
    231.79x = 347.65 × 77.71
  4. Step 4: Simplify right side
    231.79x = 27,015.88
  5. Step 5: Solve for x
    x = 27,015.88/231.79
  6. Step 6: Final answer
    x = 116.55

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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.