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Finding the Fourth Proportional to 231.89, 347.72 and 87.50

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Solution

The fourth proportional to 231.89, 347.72 and 87.50 is: 131.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.89 : 347.72 = 87.50 : x
  2. Step 2: Convert to fraction form
    231.89/347.72 = 87.50/x
  3. Step 3: Cross multiply
    231.89x = 347.72 × 87.50
  4. Step 4: Simplify right side
    231.89x = 30,425.50
  5. Step 5: Solve for x
    x = 30,425.50/231.89
  6. Step 6: Final answer
    x = 131.21

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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.