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Finding the Fourth Proportional to 1,821.31, 2,731 and 794.75

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Solution

The fourth proportional to 1,821.31, 2,731 and 794.75 is: 1,191.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.31 : 2,731 = 794.75 : x
  2. Step 2: Convert to fraction form
    1,821.31/2,731 = 794.75/x
  3. Step 3: Cross multiply
    1,821.31x = 2,731 × 794.75
  4. Step 4: Simplify right side
    1,821.31x = 2,170,462.25
  5. Step 5: Solve for x
    x = 2,170,462.25/1,821.31
  6. Step 6: Final answer
    x = 1,191.70

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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.