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Finding the Fourth Proportional to 7,836.80, 11,755.20 and 7,318.40

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Solution

The fourth proportional to 7,836.80, 11,755.20 and 7,318.40 is: 10,977.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,836.80 : 11,755.20 = 7,318.40 : x
  2. Step 2: Convert to fraction form
    7,836.80/11,755.20 = 7,318.40/x
  3. Step 3: Cross multiply
    7,836.80x = 11,755.20 × 7,318.40
  4. Step 4: Simplify right side
    7,836.80x = 86,029,255.68
  5. Step 5: Solve for x
    x = 86,029,255.68/7,836.80
  6. Step 6: Final answer
    x = 10,977.60

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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.