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Finding the Fourth Proportional to 100,579.89, 138,814.26 and 67,104.21

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Solution

The fourth proportional to 100,579.89, 138,814.26 and 67,104.21 is: 92,613.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,579.89 : 138,814.26 = 67,104.21 : x
  2. Step 2: Convert to fraction form
    100,579.89/138,814.26 = 67,104.21/x
  3. Step 3: Cross multiply
    100,579.89x = 138,814.26 × 67,104.21
  4. Step 4: Simplify right side
    100,579.89x = 9,315,021,254.03
  5. Step 5: Solve for x
    x = 9,315,021,254.03/100,579.89
  6. Step 6: Final answer
    x = 92,613.16

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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.