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Finding the Fourth Proportional to 681.40, 1,022.18 and 265.15

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Solution

The fourth proportional to 681.40, 1,022.18 and 265.15 is: 397.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.40 : 1,022.18 = 265.15 : x
  2. Step 2: Convert to fraction form
    681.40/1,022.18 = 265.15/x
  3. Step 3: Cross multiply
    681.40x = 1,022.18 × 265.15
  4. Step 4: Simplify right side
    681.40x = 271,029.70
  5. Step 5: Solve for x
    x = 271,029.70/681.40
  6. Step 6: Final answer
    x = 397.75

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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.