Home / 20,853.75-28,778.19-11,422.35

Finding the Fourth Proportional to 20,853.75, 28,778.19 and 11,422.35

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Solution

The fourth proportional to 20,853.75, 28,778.19 and 11,422.35 is: 15,762.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,853.75 : 28,778.19 = 11,422.35 : x
  2. Step 2: Convert to fraction form
    20,853.75/28,778.19 = 11,422.35/x
  3. Step 3: Cross multiply
    20,853.75x = 28,778.19 × 11,422.35
  4. Step 4: Simplify right side
    20,853.75x = 328,714,558.55
  5. Step 5: Solve for x
    x = 328,714,558.55/20,853.75
  6. Step 6: Final answer
    x = 15,762.85

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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.