Home / 20,722.53-28,606.70-12,221.79

Finding the Fourth Proportional to 20,722.53, 28,606.70 and 12,221.79

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Solution

The fourth proportional to 20,722.53, 28,606.70 and 12,221.79 is: 16,871.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,722.53 : 28,606.70 = 12,221.79 : x
  2. Step 2: Convert to fraction form
    20,722.53/28,606.70 = 12,221.79/x
  3. Step 3: Cross multiply
    20,722.53x = 28,606.70 × 12,221.79
  4. Step 4: Simplify right side
    20,722.53x = 349,625,018.88
  5. Step 5: Solve for x
    x = 349,625,018.88/20,722.53
  6. Step 6: Final answer
    x = 16,871.73

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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.