Home / 21,622.48-32,221.79-20,917.78

Finding the Fourth Proportional to 21,622.48, 32,221.79 and 20,917.78

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Solution

The fourth proportional to 21,622.48, 32,221.79 and 20,917.78 is: 31,171.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,622.48 : 32,221.79 = 20,917.78 : x
  2. Step 2: Convert to fraction form
    21,622.48/32,221.79 = 20,917.78/x
  3. Step 3: Cross multiply
    21,622.48x = 32,221.79 × 20,917.78
  4. Step 4: Simplify right side
    21,622.48x = 674,008,314.43
  5. Step 5: Solve for x
    x = 674,008,314.43/21,622.48
  6. Step 6: Final answer
    x = 31,171.65

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.