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Finding the Fourth Proportional to 101,909.90, 140,536.68 and 79,208.84

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Solution

The fourth proportional to 101,909.90, 140,536.68 and 79,208.84 is: 109,231.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,909.90 : 140,536.68 = 79,208.84 : x
  2. Step 2: Convert to fraction form
    101,909.90/140,536.68 = 79,208.84/x
  3. Step 3: Cross multiply
    101,909.90x = 140,536.68 × 79,208.84
  4. Step 4: Simplify right side
    101,909.90x = 11,131,747,400.25
  5. Step 5: Solve for x
    x = 11,131,747,400.25/101,909.90
  6. Step 6: Final answer
    x = 109,231.27

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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.