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Finding the Fourth Proportional to 868.30, 1,302.45 and 862.90

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Solution

The fourth proportional to 868.30, 1,302.45 and 862.90 is: 1,294.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.30 : 1,302.45 = 862.90 : x
  2. Step 2: Convert to fraction form
    868.30/1,302.45 = 862.90/x
  3. Step 3: Cross multiply
    868.30x = 1,302.45 × 862.90
  4. Step 4: Simplify right side
    868.30x = 1,123,884.11
  5. Step 5: Solve for x
    x = 1,123,884.11/868.30
  6. Step 6: Final answer
    x = 1,294.35

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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.