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Finding the Fourth Proportional to 681.13, 1,021.30 and 372.90

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Solution

The fourth proportional to 681.13, 1,021.30 and 372.90 is: 559.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.13 : 1,021.30 = 372.90 : x
  2. Step 2: Convert to fraction form
    681.13/1,021.30 = 372.90/x
  3. Step 3: Cross multiply
    681.13x = 1,021.30 × 372.90
  4. Step 4: Simplify right side
    681.13x = 380,842.77
  5. Step 5: Solve for x
    x = 380,842.77/681.13
  6. Step 6: Final answer
    x = 559.13

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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.