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Finding the Fourth Proportional to 1,882.31, 2,821.49 and 785.15

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Solution

The fourth proportional to 1,882.31, 2,821.49 and 785.15 is: 1,176.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,882.31 : 2,821.49 = 785.15 : x
  2. Step 2: Convert to fraction form
    1,882.31/2,821.49 = 785.15/x
  3. Step 3: Cross multiply
    1,882.31x = 2,821.49 × 785.15
  4. Step 4: Simplify right side
    1,882.31x = 2,215,288.95
  5. Step 5: Solve for x
    x = 2,215,288.95/1,882.31
  6. Step 6: Final answer
    x = 1,176.90

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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.