Home / 8,131.32-11,226.40-6,642.80

Finding the Fourth Proportional to 8,131.32, 11,226.40 and 6,642.80

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Solution

The fourth proportional to 8,131.32, 11,226.40 and 6,642.80 is: 9,171.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,131.32 : 11,226.40 = 6,642.80 : x
  2. Step 2: Convert to fraction form
    8,131.32/11,226.40 = 6,642.80/x
  3. Step 3: Cross multiply
    8,131.32x = 11,226.40 × 6,642.80
  4. Step 4: Simplify right side
    8,131.32x = 74,574,729.92
  5. Step 5: Solve for x
    x = 74,574,729.92/8,131.32
  6. Step 6: Final answer
    x = 9,171.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.