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Finding the Fourth Proportional to 20,340.80, 30,518.40 and 19,620.80

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Solution

The fourth proportional to 20,340.80, 30,518.40 and 19,620.80 is: 29,438.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,340.80 : 30,518.40 = 19,620.80 : x
  2. Step 2: Convert to fraction form
    20,340.80/30,518.40 = 19,620.80/x
  3. Step 3: Cross multiply
    20,340.80x = 30,518.40 × 19,620.80
  4. Step 4: Simplify right side
    20,340.80x = 598,795,422.72
  5. Step 5: Solve for x
    x = 598,795,422.72/20,340.80
  6. Step 6: Final answer
    x = 29,438.15

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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.