Home / 7,881.20-11,805.60-5,418.80

Finding the Fourth Proportional to 7,881.20, 11,805.60 and 5,418.80

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Solution

The fourth proportional to 7,881.20, 11,805.60 and 5,418.80 is: 8,117.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,881.20 : 11,805.60 = 5,418.80 : x
  2. Step 2: Convert to fraction form
    7,881.20/11,805.60 = 5,418.80/x
  3. Step 3: Cross multiply
    7,881.20x = 11,805.60 × 5,418.80
  4. Step 4: Simplify right side
    7,881.20x = 63,972,185.28
  5. Step 5: Solve for x
    x = 63,972,185.28/7,881.20
  6. Step 6: Final answer
    x = 8,117.06

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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.