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Finding the Fourth Proportional to 868.56, 1,302.22 and 320.66

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Solution

The fourth proportional to 868.56, 1,302.22 and 320.66 is: 480.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.56 : 1,302.22 = 320.66 : x
  2. Step 2: Convert to fraction form
    868.56/1,302.22 = 320.66/x
  3. Step 3: Cross multiply
    868.56x = 1,302.22 × 320.66
  4. Step 4: Simplify right side
    868.56x = 417,568.64
  5. Step 5: Solve for x
    x = 417,568.64/868.56
  6. Step 6: Final answer
    x = 480.76

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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.