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Finding the Fourth Proportional to 1,792.68, 2,689.20 and 638.52

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Solution

The fourth proportional to 1,792.68, 2,689.20 and 638.52 is: 957.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,792.68 : 2,689.20 = 638.52 : x
  2. Step 2: Convert to fraction form
    1,792.68/2,689.20 = 638.52/x
  3. Step 3: Cross multiply
    1,792.68x = 2,689.20 × 638.52
  4. Step 4: Simplify right side
    1,792.68x = 1,717,107.98
  5. Step 5: Solve for x
    x = 1,717,107.98/1,792.68
  6. Step 6: Final answer
    x = 957.84

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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.