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Finding the Fourth Proportional to 68,863.65, 103,289.40 and 18,939.30

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Solution

The fourth proportional to 68,863.65, 103,289.40 and 18,939.30 is: 28,407.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,863.65 : 103,289.40 = 18,939.30 : x
  2. Step 2: Convert to fraction form
    68,863.65/103,289.40 = 18,939.30/x
  3. Step 3: Cross multiply
    68,863.65x = 103,289.40 × 18,939.30
  4. Step 4: Simplify right side
    68,863.65x = 1,956,228,933.42
  5. Step 5: Solve for x
    x = 1,956,228,933.42/68,863.65
  6. Step 6: Final answer
    x = 28,407.28

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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.