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Finding the Fourth Proportional to 26,612.80, 39,919.20 and 6,891.20

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Solution

The fourth proportional to 26,612.80, 39,919.20 and 6,891.20 is: 10,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    26,612.80 : 39,919.20 = 6,891.20 : x
  2. Step 2: Convert to fraction form
    26,612.80/39,919.20 = 6,891.20/x
  3. Step 3: Cross multiply
    26,612.80x = 39,919.20 × 6,891.20
  4. Step 4: Simplify right side
    26,612.80x = 275,091,191.04
  5. Step 5: Solve for x
    x = 275,091,191.04/26,612.80
  6. Step 6: Final answer
    x = 10,336.80

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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.