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Finding the Fourth Proportional to 68,740.92, 103,124.34 and 21,981.24

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Solution

The fourth proportional to 68,740.92, 103,124.34 and 21,981.24 is: 32,976.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,740.92 : 103,124.34 = 21,981.24 : x
  2. Step 2: Convert to fraction form
    68,740.92/103,124.34 = 21,981.24/x
  3. Step 3: Cross multiply
    68,740.92x = 103,124.34 × 21,981.24
  4. Step 4: Simplify right side
    68,740.92x = 2,266,800,867.38
  5. Step 5: Solve for x
    x = 2,266,800,867.38/68,740.92
  6. Step 6: Final answer
    x = 32,976.00

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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.