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Finding the Fourth Proportional to 1,449.55, 2,000.56 and 820.11

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Solution

The fourth proportional to 1,449.55, 2,000.56 and 820.11 is: 1,131.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.55 : 2,000.56 = 820.11 : x
  2. Step 2: Convert to fraction form
    1,449.55/2,000.56 = 820.11/x
  3. Step 3: Cross multiply
    1,449.55x = 2,000.56 × 820.11
  4. Step 4: Simplify right side
    1,449.55x = 1,640,679.26
  5. Step 5: Solve for x
    x = 1,640,679.26/1,449.55
  6. Step 6: Final answer
    x = 1,131.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.