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Finding the Fourth Proportional to 869.72, 1,304.60 and 220.46

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Solution

The fourth proportional to 869.72, 1,304.60 and 220.46 is: 330.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.72 : 1,304.60 = 220.46 : x
  2. Step 2: Convert to fraction form
    869.72/1,304.60 = 220.46/x
  3. Step 3: Cross multiply
    869.72x = 1,304.60 × 220.46
  4. Step 4: Simplify right side
    869.72x = 287,612.12
  5. Step 5: Solve for x
    x = 287,612.12/869.72
  6. Step 6: Final answer
    x = 330.70

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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.