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Finding the Fourth Proportional to 68,438.90, 102,668.08 and 21,057.92

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Solution

The fourth proportional to 68,438.90, 102,668.08 and 21,057.92 is: 31,589.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,438.90 : 102,668.08 = 21,057.92 : x
  2. Step 2: Convert to fraction form
    68,438.90/102,668.08 = 21,057.92/x
  3. Step 3: Cross multiply
    68,438.90x = 102,668.08 × 21,057.92
  4. Step 4: Simplify right side
    68,438.90x = 2,161,976,215.19
  5. Step 5: Solve for x
    x = 2,161,976,215.19/68,438.90
  6. Step 6: Final answer
    x = 31,589.87

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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.