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Finding the Fourth Proportional to 868.56, 1,302.81 and 219.28

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Solution

The fourth proportional to 868.56, 1,302.81 and 219.28 is: 328.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.56 : 1,302.81 = 219.28 : x
  2. Step 2: Convert to fraction form
    868.56/1,302.81 = 219.28/x
  3. Step 3: Cross multiply
    868.56x = 1,302.81 × 219.28
  4. Step 4: Simplify right side
    868.56x = 285,680.18
  5. Step 5: Solve for x
    x = 285,680.18/868.56
  6. Step 6: Final answer
    x = 328.91

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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.