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Finding the Fourth Proportional to 265.50, 398.18 and 82.85

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Solution

The fourth proportional to 265.50, 398.18 and 82.85 is: 124.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.50 : 398.18 = 82.85 : x
  2. Step 2: Convert to fraction form
    265.50/398.18 = 82.85/x
  3. Step 3: Cross multiply
    265.50x = 398.18 × 82.85
  4. Step 4: Simplify right side
    265.50x = 32,987.43
  5. Step 5: Solve for x
    x = 32,987.43/265.50
  6. Step 6: Final answer
    x = 124.25

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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.