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Finding the Fourth Proportional to 487.76, 731.36 and 231.26

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Solution

The fourth proportional to 487.76, 731.36 and 231.26 is: 346.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.76 : 731.36 = 231.26 : x
  2. Step 2: Convert to fraction form
    487.76/731.36 = 231.26/x
  3. Step 3: Cross multiply
    487.76x = 731.36 × 231.26
  4. Step 4: Simplify right side
    487.76x = 169,134.31
  5. Step 5: Solve for x
    x = 169,134.31/487.76
  6. Step 6: Final answer
    x = 346.76

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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.