Home / 80,786.09-121,178.28-20,814.32

Finding the Fourth Proportional to 80,786.09, 121,178.28 and 20,814.32

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Solution

The fourth proportional to 80,786.09, 121,178.28 and 20,814.32 is: 31,221.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,786.09 : 121,178.28 = 20,814.32 : x
  2. Step 2: Convert to fraction form
    80,786.09/121,178.28 = 20,814.32/x
  3. Step 3: Cross multiply
    80,786.09x = 121,178.28 × 20,814.32
  4. Step 4: Simplify right side
    80,786.09x = 2,522,243,799.92
  5. Step 5: Solve for x
    x = 2,522,243,799.92/80,786.09
  6. Step 6: Final answer
    x = 31,221.26

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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.