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Finding the Fourth Proportional to 869.83, 1,304.74 and 220.56

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Solution

The fourth proportional to 869.83, 1,304.74 and 220.56 is: 330.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.83 : 1,304.74 = 220.56 : x
  2. Step 2: Convert to fraction form
    869.83/1,304.74 = 220.56/x
  3. Step 3: Cross multiply
    869.83x = 1,304.74 × 220.56
  4. Step 4: Simplify right side
    869.83x = 287,772.90
  5. Step 5: Solve for x
    x = 287,772.90/869.83
  6. Step 6: Final answer
    x = 330.84

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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.