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Finding the Fourth Proportional to 1,449.12, 1,999.80 and 889.92

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Solution

The fourth proportional to 1,449.12, 1,999.80 and 889.92 is: 1,228.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,449.12 : 1,999.80 = 889.92 : x
  2. Step 2: Convert to fraction form
    1,449.12/1,999.80 = 889.92/x
  3. Step 3: Cross multiply
    1,449.12x = 1,999.80 × 889.92
  4. Step 4: Simplify right side
    1,449.12x = 1,779,662.02
  5. Step 5: Solve for x
    x = 1,779,662.02/1,449.12
  6. Step 6: Final answer
    x = 1,228.10

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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.