Home / 20,131.05-27,781.74-11,178.66

Finding the Fourth Proportional to 20,131.05, 27,781.74 and 11,178.66

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Solution

The fourth proportional to 20,131.05, 27,781.74 and 11,178.66 is: 15,427.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.05 : 27,781.74 = 11,178.66 : x
  2. Step 2: Convert to fraction form
    20,131.05/27,781.74 = 11,178.66/x
  3. Step 3: Cross multiply
    20,131.05x = 27,781.74 × 11,178.66
  4. Step 4: Simplify right side
    20,131.05x = 310,562,625.67
  5. Step 5: Solve for x
    x = 310,562,625.67/20,131.05
  6. Step 6: Final answer
    x = 15,427.05

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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.