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Finding the Fourth Proportional to 681.80, 1,021.66 and 316.49

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Solution

The fourth proportional to 681.80, 1,021.66 and 316.49 is: 474.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.80 : 1,021.66 = 316.49 : x
  2. Step 2: Convert to fraction form
    681.80/1,021.66 = 316.49/x
  3. Step 3: Cross multiply
    681.80x = 1,021.66 × 316.49
  4. Step 4: Simplify right side
    681.80x = 323,339.27
  5. Step 5: Solve for x
    x = 323,339.27/681.80
  6. Step 6: Final answer
    x = 474.25

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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.