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Finding the Fourth Proportional to 68,458.60, 102,698.70 and 21,716.20

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Solution

The fourth proportional to 68,458.60, 102,698.70 and 21,716.20 is: 32,577.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,458.60 : 102,698.70 = 21,716.20 : x
  2. Step 2: Convert to fraction form
    68,458.60/102,698.70 = 21,716.20/x
  3. Step 3: Cross multiply
    68,458.60x = 102,698.70 × 21,716.20
  4. Step 4: Simplify right side
    68,458.60x = 2,230,225,508.94
  5. Step 5: Solve for x
    x = 2,230,225,508.94/68,458.60
  6. Step 6: Final answer
    x = 32,577.73

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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.