Home / 20,215.50-27,899.85-12,257.70

Finding the Fourth Proportional to 20,215.50, 27,899.85 and 12,257.70

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Solution

The fourth proportional to 20,215.50, 27,899.85 and 12,257.70 is: 16,917.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.50 : 27,899.85 = 12,257.70 : x
  2. Step 2: Convert to fraction form
    20,215.50/27,899.85 = 12,257.70/x
  3. Step 3: Cross multiply
    20,215.50x = 27,899.85 × 12,257.70
  4. Step 4: Simplify right side
    20,215.50x = 341,987,991.35
  5. Step 5: Solve for x
    x = 341,987,991.35/20,215.50
  6. Step 6: Final answer
    x = 16,917.12

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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.