Home / 20,856.46-28,758.85-13,290.80

Finding the Fourth Proportional to 20,856.46, 28,758.85 and 13,290.80

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Solution

The fourth proportional to 20,856.46, 28,758.85 and 13,290.80 is: 18,326.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.46 : 28,758.85 = 13,290.80 : x
  2. Step 2: Convert to fraction form
    20,856.46/28,758.85 = 13,290.80/x
  3. Step 3: Cross multiply
    20,856.46x = 28,758.85 × 13,290.80
  4. Step 4: Simplify right side
    20,856.46x = 382,228,123.58
  5. Step 5: Solve for x
    x = 382,228,123.58/20,856.46
  6. Step 6: Final answer
    x = 18,326.61

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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.