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Finding the Fourth Proportional to 100,310.22, 138,400.11 and 79,023.42

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Solution

The fourth proportional to 100,310.22, 138,400.11 and 79,023.42 is: 109,030.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,310.22 : 138,400.11 = 79,023.42 : x
  2. Step 2: Convert to fraction form
    100,310.22/138,400.11 = 79,023.42/x
  3. Step 3: Cross multiply
    100,310.22x = 138,400.11 × 79,023.42
  4. Step 4: Simplify right side
    100,310.22x = 10,936,850,020.58
  5. Step 5: Solve for x
    x = 10,936,850,020.58/100,310.22
  6. Step 6: Final answer
    x = 109,030.27

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1.5x scale

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.