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Finding the Fourth Proportional to 681.14, 1,020.62 and 388.10

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Solution

The fourth proportional to 681.14, 1,020.62 and 388.10 is: 581.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.14 : 1,020.62 = 388.10 : x
  2. Step 2: Convert to fraction form
    681.14/1,020.62 = 388.10/x
  3. Step 3: Cross multiply
    681.14x = 1,020.62 × 388.10
  4. Step 4: Simplify right side
    681.14x = 396,098.49
  5. Step 5: Solve for x
    x = 396,098.49/681.14
  6. Step 6: Final answer
    x = 581.53

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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.