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Finding the Fourth Proportional to 1,449.54, 1,999.89 and 820.01

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Solution

The fourth proportional to 1,449.54, 1,999.89 and 820.01 is: 1,131.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.54 : 1,999.89 = 820.01 : x
  2. Step 2: Convert to fraction form
    1,449.54/1,999.89 = 820.01/x
  3. Step 3: Cross multiply
    1,449.54x = 1,999.89 × 820.01
  4. Step 4: Simplify right side
    1,449.54x = 1,639,929.80
  5. Step 5: Solve for x
    x = 1,639,929.80/1,449.54
  6. Step 6: Final answer
    x = 1,131.34

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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.