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Finding the Fourth Proportional to 21,200.40, 31,800.60 and 20,131.20

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Solution

The fourth proportional to 21,200.40, 31,800.60 and 20,131.20 is: 30,196.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,200.40 : 31,800.60 = 20,131.20 : x
  2. Step 2: Convert to fraction form
    21,200.40/31,800.60 = 20,131.20/x
  3. Step 3: Cross multiply
    21,200.40x = 31,800.60 × 20,131.20
  4. Step 4: Simplify right side
    21,200.40x = 640,184,238.72
  5. Step 5: Solve for x
    x = 640,184,238.72/21,200.40
  6. Step 6: Final answer
    x = 30,196.80

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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.