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Finding the Fourth Proportional to 68,811.68, 103,205.21 and 18,885.20

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Solution

The fourth proportional to 68,811.68, 103,205.21 and 18,885.20 is: 28,324.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,811.68 : 103,205.21 = 18,885.20 : x
  2. Step 2: Convert to fraction form
    68,811.68/103,205.21 = 18,885.20/x
  3. Step 3: Cross multiply
    68,811.68x = 103,205.21 × 18,885.20
  4. Step 4: Simplify right side
    68,811.68x = 1,949,051,161.31
  5. Step 5: Solve for x
    x = 1,949,051,161.31/68,811.68
  6. Step 6: Final answer
    x = 28,324.42

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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.