Home / 8,051.20-12,105.60-7,878.40

Finding the Fourth Proportional to 8,051.20, 12,105.60 and 7,878.40

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Solution

The fourth proportional to 8,051.20, 12,105.60 and 7,878.40 is: 11,845.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,051.20 : 12,105.60 = 7,878.40 : x
  2. Step 2: Convert to fraction form
    8,051.20/12,105.60 = 7,878.40/x
  3. Step 3: Cross multiply
    8,051.20x = 12,105.60 × 7,878.40
  4. Step 4: Simplify right side
    8,051.20x = 95,372,759.04
  5. Step 5: Solve for x
    x = 95,372,759.04/8,051.20
  6. Step 6: Final answer
    x = 11,845.78

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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.