Home / 20,131.50-27,780.93-11,178.77

Finding the Fourth Proportional to 20,131.50, 27,780.93 and 11,178.77

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Solution

The fourth proportional to 20,131.50, 27,780.93 and 11,178.77 is: 15,426.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,131.50 : 27,780.93 = 11,178.77 : x
  2. Step 2: Convert to fraction form
    20,131.50/27,780.93 = 11,178.77/x
  3. Step 3: Cross multiply
    20,131.50x = 27,780.93 × 11,178.77
  4. Step 4: Simplify right side
    20,131.50x = 310,556,626.86
  5. Step 5: Solve for x
    x = 310,556,626.86/20,131.50
  6. Step 6: Final answer
    x = 15,426.40

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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.