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Finding the Fourth Proportional to 869.91, 1,304.76 and 220.65

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Solution

The fourth proportional to 869.91, 1,304.76 and 220.65 is: 330.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.91 : 1,304.76 = 220.65 : x
  2. Step 2: Convert to fraction form
    869.91/1,304.76 = 220.65/x
  3. Step 3: Cross multiply
    869.91x = 1,304.76 × 220.65
  4. Step 4: Simplify right side
    869.91x = 287,895.29
  5. Step 5: Solve for x
    x = 287,895.29/869.91
  6. Step 6: Final answer
    x = 330.95

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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.