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Finding the Fourth Proportional to 868.10, 1,302.48 and 380.81

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Solution

The fourth proportional to 868.10, 1,302.48 and 380.81 is: 571.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.10 : 1,302.48 = 380.81 : x
  2. Step 2: Convert to fraction form
    868.10/1,302.48 = 380.81/x
  3. Step 3: Cross multiply
    868.10x = 1,302.48 × 380.81
  4. Step 4: Simplify right side
    868.10x = 495,990.90
  5. Step 5: Solve for x
    x = 495,990.90/868.10
  6. Step 6: Final answer
    x = 571.36

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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.