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Finding the Fourth Proportional to 9,920.80, 14,879.49 and 2,805.53

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Solution

The fourth proportional to 9,920.80, 14,879.49 and 2,805.53 is: 4,207.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,920.80 : 14,879.49 = 2,805.53 : x
  2. Step 2: Convert to fraction form
    9,920.80/14,879.49 = 2,805.53/x
  3. Step 3: Cross multiply
    9,920.80x = 14,879.49 × 2,805.53
  4. Step 4: Simplify right side
    9,920.80x = 41,744,878.75
  5. Step 5: Solve for x
    x = 41,744,878.75/9,920.80
  6. Step 6: Final answer
    x = 4,207.81

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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.