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Finding the Fourth Proportional to 681.61, 1,021.78 and 316.29

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Solution

The fourth proportional to 681.61, 1,021.78 and 316.29 is: 474.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.61 : 1,021.78 = 316.29 : x
  2. Step 2: Convert to fraction form
    681.61/1,021.78 = 316.29/x
  3. Step 3: Cross multiply
    681.61x = 1,021.78 × 316.29
  4. Step 4: Simplify right side
    681.61x = 323,177.21
  5. Step 5: Solve for x
    x = 323,177.21/681.61
  6. Step 6: Final answer
    x = 474.14

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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.