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Finding the Fourth Proportional to 868.57, 1,302.81 and 219.31

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Solution

The fourth proportional to 868.57, 1,302.81 and 219.31 is: 328.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.57 : 1,302.81 = 219.31 : x
  2. Step 2: Convert to fraction form
    868.57/1,302.81 = 219.31/x
  3. Step 3: Cross multiply
    868.57x = 1,302.81 × 219.31
  4. Step 4: Simplify right side
    868.57x = 285,719.26
  5. Step 5: Solve for x
    x = 285,719.26/868.57
  6. Step 6: Final answer
    x = 328.95

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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.