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Finding the Fourth Proportional to 868.57, 1,197.99 and 553.57

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Solution

The fourth proportional to 868.57, 1,197.99 and 553.57 is: 763.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.57 : 1,197.99 = 553.57 : x
  2. Step 2: Convert to fraction form
    868.57/1,197.99 = 553.57/x
  3. Step 3: Cross multiply
    868.57x = 1,197.99 × 553.57
  4. Step 4: Simplify right side
    868.57x = 663,171.32
  5. Step 5: Solve for x
    x = 663,171.32/868.57
  6. Step 6: Final answer
    x = 763.52

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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.