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Finding the Fourth Proportional to 681.29, 1,021.51 and 372.71

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Solution

The fourth proportional to 681.29, 1,021.51 and 372.71 is: 558.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.29 : 1,021.51 = 372.71 : x
  2. Step 2: Convert to fraction form
    681.29/1,021.51 = 372.71/x
  3. Step 3: Cross multiply
    681.29x = 1,021.51 × 372.71
  4. Step 4: Simplify right side
    681.29x = 380,726.99
  5. Step 5: Solve for x
    x = 380,726.99/681.29
  6. Step 6: Final answer
    x = 558.83

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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.