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Finding the Fourth Proportional to 68,605.32, 102,906.86 and 21,857.56

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Solution

The fourth proportional to 68,605.32, 102,906.86 and 21,857.56 is: 32,785.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,605.32 : 102,906.86 = 21,857.56 : x
  2. Step 2: Convert to fraction form
    68,605.32/102,906.86 = 21,857.56/x
  3. Step 3: Cross multiply
    68,605.32x = 102,906.86 × 21,857.56
  4. Step 4: Simplify right side
    68,605.32x = 2,249,292,866.86
  5. Step 5: Solve for x
    x = 2,249,292,866.86/68,605.32
  6. Step 6: Final answer
    x = 32,785.98

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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.