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Finding the Fourth Proportional to 868.80, 1,302.24 and 685.92

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Solution

The fourth proportional to 868.80, 1,302.24 and 685.92 is: 1,028.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.80 : 1,302.24 = 685.92 : x
  2. Step 2: Convert to fraction form
    868.80/1,302.24 = 685.92/x
  3. Step 3: Cross multiply
    868.80x = 1,302.24 × 685.92
  4. Step 4: Simplify right side
    868.80x = 893,232.46
  5. Step 5: Solve for x
    x = 893,232.46/868.80
  6. Step 6: Final answer
    x = 1,028.12

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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.