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Finding the Fourth Proportional to 231.88, 347.84 and 87.66

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Solution

The fourth proportional to 231.88, 347.84 and 87.66 is: 131.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.88 : 347.84 = 87.66 : x
  2. Step 2: Convert to fraction form
    231.88/347.84 = 87.66/x
  3. Step 3: Cross multiply
    231.88x = 347.84 × 87.66
  4. Step 4: Simplify right side
    231.88x = 30,491.65
  5. Step 5: Solve for x
    x = 30,491.65/231.88
  6. Step 6: Final answer
    x = 131.50

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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.