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Finding the Fourth Proportional to 100,388.91, 138,561.90 and 68,178.04

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Solution

The fourth proportional to 100,388.91, 138,561.90 and 68,178.04 is: 94,102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,388.91 : 138,561.90 = 68,178.04 : x
  2. Step 2: Convert to fraction form
    100,388.91/138,561.90 = 68,178.04/x
  3. Step 3: Cross multiply
    100,388.91x = 138,561.90 × 68,178.04
  4. Step 4: Simplify right side
    100,388.91x = 9,446,878,760.68
  5. Step 5: Solve for x
    x = 9,446,878,760.68/100,388.91
  6. Step 6: Final answer
    x = 94,102.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.