Home / 21,332.20-31,998.30-18,221.80

Finding the Fourth Proportional to 21,332.20, 31,998.30 and 18,221.80

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Solution

The fourth proportional to 21,332.20, 31,998.30 and 18,221.80 is: 27,332.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,332.20 : 31,998.30 = 18,221.80 : x
  2. Step 2: Convert to fraction form
    21,332.20/31,998.30 = 18,221.80/x
  3. Step 3: Cross multiply
    21,332.20x = 31,998.30 × 18,221.80
  4. Step 4: Simplify right side
    21,332.20x = 583,066,622.94
  5. Step 5: Solve for x
    x = 583,066,622.94/21,332.20
  6. Step 6: Final answer
    x = 27,332.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.