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Finding the Fourth Proportional to 1,793.19, 2,689.78 and 638.13

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Solution

The fourth proportional to 1,793.19, 2,689.78 and 638.13 is: 957.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,793.19 : 2,689.78 = 638.13 : x
  2. Step 2: Convert to fraction form
    1,793.19/2,689.78 = 638.13/x
  3. Step 3: Cross multiply
    1,793.19x = 2,689.78 × 638.13
  4. Step 4: Simplify right side
    1,793.19x = 1,716,414.27
  5. Step 5: Solve for x
    x = 1,716,414.27/1,793.19
  6. Step 6: Final answer
    x = 957.19

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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.