Home / 20,855.08-28,780.26-11,423.72

Finding the Fourth Proportional to 20,855.08, 28,780.26 and 11,423.72

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Solution

The fourth proportional to 20,855.08, 28,780.26 and 11,423.72 is: 15,764.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,855.08 : 28,780.26 = 11,423.72 : x
  2. Step 2: Convert to fraction form
    20,855.08/28,780.26 = 11,423.72/x
  3. Step 3: Cross multiply
    20,855.08x = 28,780.26 × 11,423.72
  4. Step 4: Simplify right side
    20,855.08x = 328,777,631.77
  5. Step 5: Solve for x
    x = 328,777,631.77/20,855.08
  6. Step 6: Final answer
    x = 15,764.87

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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.