Home / 20,855.56-28,780.50-11,423.92

Finding the Fourth Proportional to 20,855.56, 28,780.50 and 11,423.92

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Solution

The fourth proportional to 20,855.56, 28,780.50 and 11,423.92 is: 15,764.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.56 : 28,780.50 = 11,423.92 : x
  2. Step 2: Convert to fraction form
    20,855.56/28,780.50 = 11,423.92/x
  3. Step 3: Cross multiply
    20,855.56x = 28,780.50 × 11,423.92
  4. Step 4: Simplify right side
    20,855.56x = 328,786,129.56
  5. Step 5: Solve for x
    x = 328,786,129.56/20,855.56
  6. Step 6: Final answer
    x = 15,764.91

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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.