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Finding the Fourth Proportional to 7,716.80, 11,575.20 and 5,772.80

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Solution

The fourth proportional to 7,716.80, 11,575.20 and 5,772.80 is: 8,659.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,716.80 : 11,575.20 = 5,772.80 : x
  2. Step 2: Convert to fraction form
    7,716.80/11,575.20 = 5,772.80/x
  3. Step 3: Cross multiply
    7,716.80x = 11,575.20 × 5,772.80
  4. Step 4: Simplify right side
    7,716.80x = 66,821,314.56
  5. Step 5: Solve for x
    x = 66,821,314.56/7,716.80
  6. Step 6: Final answer
    x = 8,659.20

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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.