Home / 20,856.84-28,786.16-13,305.44

Finding the Fourth Proportional to 20,856.84, 28,786.16 and 13,305.44

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Solution

The fourth proportional to 20,856.84, 28,786.16 and 13,305.44 is: 18,363.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.84 : 28,786.16 = 13,305.44 : x
  2. Step 2: Convert to fraction form
    20,856.84/28,786.16 = 13,305.44/x
  3. Step 3: Cross multiply
    20,856.84x = 28,786.16 × 13,305.44
  4. Step 4: Simplify right side
    20,856.84x = 383,012,524.71
  5. Step 5: Solve for x
    x = 383,012,524.71/20,856.84
  6. Step 6: Final answer
    x = 18,363.88

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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.