Home / 20,131.10-27,780.75-11,178.63

Finding the Fourth Proportional to 20,131.10, 27,780.75 and 11,178.63

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Solution

The fourth proportional to 20,131.10, 27,780.75 and 11,178.63 is: 15,426.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.10 : 27,780.75 = 11,178.63 : x
  2. Step 2: Convert to fraction form
    20,131.10/27,780.75 = 11,178.63/x
  3. Step 3: Cross multiply
    20,131.10x = 27,780.75 × 11,178.63
  4. Step 4: Simplify right side
    20,131.10x = 310,550,725.37
  5. Step 5: Solve for x
    x = 310,550,725.37/20,131.10
  6. Step 6: Final answer
    x = 15,426.42

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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.