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Finding the Fourth Proportional to 1,821.14, 2,731.90 and 725.28

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Solution

The fourth proportional to 1,821.14, 2,731.90 and 725.28 is: 1,088.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.14 : 2,731.90 = 725.28 : x
  2. Step 2: Convert to fraction form
    1,821.14/2,731.90 = 725.28/x
  3. Step 3: Cross multiply
    1,821.14x = 2,731.90 × 725.28
  4. Step 4: Simplify right side
    1,821.14x = 1,981,392.43
  5. Step 5: Solve for x
    x = 1,981,392.43/1,821.14
  6. Step 6: Final answer
    x = 1,088.00

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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.