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Finding the Fourth Proportional to 68,657.86, 102,920.91 and 21,880.18

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Solution

The fourth proportional to 68,657.86, 102,920.91 and 21,880.18 is: 32,799.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,657.86 : 102,920.91 = 21,880.18 : x
  2. Step 2: Convert to fraction form
    68,657.86/102,920.91 = 21,880.18/x
  3. Step 3: Cross multiply
    68,657.86x = 102,920.91 × 21,880.18
  4. Step 4: Simplify right side
    68,657.86x = 2,251,928,036.56
  5. Step 5: Solve for x
    x = 2,251,928,036.56/68,657.86
  6. Step 6: Final answer
    x = 32,799.28

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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.