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Finding the Fourth Proportional to 2,720.80, 4,081.82 and 989.42

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Solution

The fourth proportional to 2,720.80, 4,081.82 and 989.42 is: 1,484.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,720.80 : 4,081.82 = 989.42 : x
  2. Step 2: Convert to fraction form
    2,720.80/4,081.82 = 989.42/x
  3. Step 3: Cross multiply
    2,720.80x = 4,081.82 × 989.42
  4. Step 4: Simplify right side
    2,720.80x = 4,038,634.34
  5. Step 5: Solve for x
    x = 4,038,634.34/2,720.80
  6. Step 6: Final answer
    x = 1,484.36

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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.