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Finding the Fourth Proportional to 68,854.35, 103,281.99 and 18,939.72

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Solution

The fourth proportional to 68,854.35, 103,281.99 and 18,939.72 is: 28,409.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,854.35 : 103,281.99 = 18,939.72 : x
  2. Step 2: Convert to fraction form
    68,854.35/103,281.99 = 18,939.72/x
  3. Step 3: Cross multiply
    68,854.35x = 103,281.99 × 18,939.72
  4. Step 4: Simplify right side
    68,854.35x = 1,956,132,287.93
  5. Step 5: Solve for x
    x = 1,956,132,287.93/68,854.35
  6. Step 6: Final answer
    x = 28,409.71

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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.