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Finding the Fourth Proportional to 265.48, 398.21 and 82.87

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Solution

The fourth proportional to 265.48, 398.21 and 82.87 is: 124.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.48 : 398.21 = 82.87 : x
  2. Step 2: Convert to fraction form
    265.48/398.21 = 82.87/x
  3. Step 3: Cross multiply
    265.48x = 398.21 × 82.87
  4. Step 4: Simplify right side
    265.48x = 32,999.66
  5. Step 5: Solve for x
    x = 32,999.66/265.48
  6. Step 6: Final answer
    x = 124.30

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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.