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Finding the Fourth Proportional to 7,218.64, 10,816.62 and 5,579.20

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Solution

The fourth proportional to 7,218.64, 10,816.62 and 5,579.20 is: 8,360.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,218.64 : 10,816.62 = 5,579.20 : x
  2. Step 2: Convert to fraction form
    7,218.64/10,816.62 = 5,579.20/x
  3. Step 3: Cross multiply
    7,218.64x = 10,816.62 × 5,579.20
  4. Step 4: Simplify right side
    7,218.64x = 60,348,086.30
  5. Step 5: Solve for x
    x = 60,348,086.30/7,218.64
  6. Step 6: Final answer
    x = 8,360.04

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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.