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Finding the Fourth Proportional to 868.29, 1,197.90 and 553.47

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Solution

The fourth proportional to 868.29, 1,197.90 and 553.47 is: 763.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.29 : 1,197.90 = 553.47 : x
  2. Step 2: Convert to fraction form
    868.29/1,197.90 = 553.47/x
  3. Step 3: Cross multiply
    868.29x = 1,197.90 × 553.47
  4. Step 4: Simplify right side
    868.29x = 663,001.71
  5. Step 5: Solve for x
    x = 663,001.71/868.29
  6. Step 6: Final answer
    x = 763.57

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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.