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Finding the Fourth Proportional to 7,489.60, 11,218.20 and 6,668.80

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Solution

The fourth proportional to 7,489.60, 11,218.20 and 6,668.80 is: 9,988.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,489.60 : 11,218.20 = 6,668.80 : x
  2. Step 2: Convert to fraction form
    7,489.60/11,218.20 = 6,668.80/x
  3. Step 3: Cross multiply
    7,489.60x = 11,218.20 × 6,668.80
  4. Step 4: Simplify right side
    7,489.60x = 74,811,932.16
  5. Step 5: Solve for x
    x = 74,811,932.16/7,489.60
  6. Step 6: Final answer
    x = 9,988.78

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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.