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Finding the Fourth Proportional to 868.28, 1,302.42 and 219.07

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Solution

The fourth proportional to 868.28, 1,302.42 and 219.07 is: 328.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.28 : 1,302.42 = 219.07 : x
  2. Step 2: Convert to fraction form
    868.28/1,302.42 = 219.07/x
  3. Step 3: Cross multiply
    868.28x = 1,302.42 × 219.07
  4. Step 4: Simplify right side
    868.28x = 285,314.64
  5. Step 5: Solve for x
    x = 285,314.64/868.28
  6. Step 6: Final answer
    x = 328.60

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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.