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Finding the Fourth Proportional to 952.97, 1,315.31 and 638.69

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Solution

The fourth proportional to 952.97, 1,315.31 and 638.69 is: 881.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    952.97 : 1,315.31 = 638.69 : x
  2. Step 2: Convert to fraction form
    952.97/1,315.31 = 638.69/x
  3. Step 3: Cross multiply
    952.97x = 1,315.31 × 638.69
  4. Step 4: Simplify right side
    952.97x = 840,065.57
  5. Step 5: Solve for x
    x = 840,065.57/952.97
  6. Step 6: Final answer
    x = 881.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.