Home / 20,808.90-28,713.06-11,856.78

Finding the Fourth Proportional to 20,808.90, 28,713.06 and 11,856.78

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Solution

The fourth proportional to 20,808.90, 28,713.06 and 11,856.78 is: 16,360.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,808.90 : 28,713.06 = 11,856.78 : x
  2. Step 2: Convert to fraction form
    20,808.90/28,713.06 = 11,856.78/x
  3. Step 3: Cross multiply
    20,808.90x = 28,713.06 × 11,856.78
  4. Step 4: Simplify right side
    20,808.90x = 340,444,435.55
  5. Step 5: Solve for x
    x = 340,444,435.55/20,808.90
  6. Step 6: Final answer
    x = 16,360.52

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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.