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Finding the Fourth Proportional to 7,216.80, 10,814.40 and 6,115.20

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Solution

The fourth proportional to 7,216.80, 10,814.40 and 6,115.20 is: 9,163.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,216.80 : 10,814.40 = 6,115.20 : x
  2. Step 2: Convert to fraction form
    7,216.80/10,814.40 = 6,115.20/x
  3. Step 3: Cross multiply
    7,216.80x = 10,814.40 × 6,115.20
  4. Step 4: Simplify right side
    7,216.80x = 66,132,218.88
  5. Step 5: Solve for x
    x = 66,132,218.88/7,216.80
  6. Step 6: Final answer
    x = 9,163.65

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1.5x scale

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.