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Finding the Fourth Proportional to 19,959.40, 29,940.02 and 6,811.90

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Solution

The fourth proportional to 19,959.40, 29,940.02 and 6,811.90 is: 10,218.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,959.40 : 29,940.02 = 6,811.90 : x
  2. Step 2: Convert to fraction form
    19,959.40/29,940.02 = 6,811.90/x
  3. Step 3: Cross multiply
    19,959.40x = 29,940.02 × 6,811.90
  4. Step 4: Simplify right side
    19,959.40x = 203,948,422.24
  5. Step 5: Solve for x
    x = 203,948,422.24/19,959.40
  6. Step 6: Final answer
    x = 10,218.16

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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.