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Finding the Fourth Proportional to 66,672.20, 100,022.70 and 19,929.80

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Solution

The fourth proportional to 66,672.20, 100,022.70 and 19,929.80 is: 29,899.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,672.20 : 100,022.70 = 19,929.80 : x
  2. Step 2: Convert to fraction form
    66,672.20/100,022.70 = 19,929.80/x
  3. Step 3: Cross multiply
    66,672.20x = 100,022.70 × 19,929.80
  4. Step 4: Simplify right side
    66,672.20x = 1,993,432,406.46
  5. Step 5: Solve for x
    x = 1,993,432,406.46/66,672.20
  6. Step 6: Final answer
    x = 29,899.00

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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.