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Finding the Fourth Proportional to 231.50, 347.30 and 77.42

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Solution

The fourth proportional to 231.50, 347.30 and 77.42 is: 116.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.50 : 347.30 = 77.42 : x
  2. Step 2: Convert to fraction form
    231.50/347.30 = 77.42/x
  3. Step 3: Cross multiply
    231.50x = 347.30 × 77.42
  4. Step 4: Simplify right side
    231.50x = 26,887.97
  5. Step 5: Solve for x
    x = 26,887.97/231.50
  6. Step 6: Final answer
    x = 116.15

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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.