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Finding the Fourth Proportional to 20,640.20, 31,025.10 and 20,251.40

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Solution

The fourth proportional to 20,640.20, 31,025.10 and 20,251.40 is: 30,440.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.20 : 31,025.10 = 20,251.40 : x
  2. Step 2: Convert to fraction form
    20,640.20/31,025.10 = 20,251.40/x
  3. Step 3: Cross multiply
    20,640.20x = 31,025.10 × 20,251.40
  4. Step 4: Simplify right side
    20,640.20x = 628,301,710.14
  5. Step 5: Solve for x
    x = 628,301,710.14/20,640.20
  6. Step 6: Final answer
    x = 30,440.68

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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.