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Finding the Fourth Proportional to 868.70, 1,197.84 and 553.46

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Solution

The fourth proportional to 868.70, 1,197.84 and 553.46 is: 763.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.70 : 1,197.84 = 553.46 : x
  2. Step 2: Convert to fraction form
    868.70/1,197.84 = 553.46/x
  3. Step 3: Cross multiply
    868.70x = 1,197.84 × 553.46
  4. Step 4: Simplify right side
    868.70x = 662,953.76
  5. Step 5: Solve for x
    x = 662,953.76/868.70
  6. Step 6: Final answer
    x = 763.16

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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.