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Finding the Fourth Proportional to 681.81, 1,022.79 and 316.71

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Solution

The fourth proportional to 681.81, 1,022.79 and 316.71 is: 475.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.81 : 1,022.79 = 316.71 : x
  2. Step 2: Convert to fraction form
    681.81/1,022.79 = 316.71/x
  3. Step 3: Cross multiply
    681.81x = 1,022.79 × 316.71
  4. Step 4: Simplify right side
    681.81x = 323,927.82
  5. Step 5: Solve for x
    x = 323,927.82/681.81
  6. Step 6: Final answer
    x = 475.10

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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.