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Finding the Fourth Proportional to 231.54, 347.28 and 87.18

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Solution

The fourth proportional to 231.54, 347.28 and 87.18 is: 130.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.54 : 347.28 = 87.18 : x
  2. Step 2: Convert to fraction form
    231.54/347.28 = 87.18/x
  3. Step 3: Cross multiply
    231.54x = 347.28 × 87.18
  4. Step 4: Simplify right side
    231.54x = 30,275.87
  5. Step 5: Solve for x
    x = 30,275.87/231.54
  6. Step 6: Final answer
    x = 130.76

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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.