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Finding the Fourth Proportional to 699.27, 1,049.21 and 288.71

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Solution

The fourth proportional to 699.27, 1,049.21 and 288.71 is: 433.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.27 : 1,049.21 = 288.71 : x
  2. Step 2: Convert to fraction form
    699.27/1,049.21 = 288.71/x
  3. Step 3: Cross multiply
    699.27x = 1,049.21 × 288.71
  4. Step 4: Simplify right side
    699.27x = 302,910.73
  5. Step 5: Solve for x
    x = 302,910.73/699.27
  6. Step 6: Final answer
    x = 433.18

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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.