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Finding the Fourth Proportional to 19,940.20, 29,910.30 and 18,320.20

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Solution

The fourth proportional to 19,940.20, 29,910.30 and 18,320.20 is: 27,480.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,940.20 : 29,910.30 = 18,320.20 : x
  2. Step 2: Convert to fraction form
    19,940.20/29,910.30 = 18,320.20/x
  3. Step 3: Cross multiply
    19,940.20x = 29,910.30 × 18,320.20
  4. Step 4: Simplify right side
    19,940.20x = 547,962,678.06
  5. Step 5: Solve for x
    x = 547,962,678.06/19,940.20
  6. Step 6: Final answer
    x = 27,480.30

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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.