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Finding the Fourth Proportional to 109,408.99, 150,909.45 and 66,988.48

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Solution

The fourth proportional to 109,408.99, 150,909.45 and 66,988.48 is: 92,398.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,408.99 : 150,909.45 = 66,988.48 : x
  2. Step 2: Convert to fraction form
    109,408.99/150,909.45 = 66,988.48/x
  3. Step 3: Cross multiply
    109,408.99x = 150,909.45 × 66,988.48
  4. Step 4: Simplify right side
    109,408.99x = 10,109,194,673.14
  5. Step 5: Solve for x
    x = 10,109,194,673.14/109,408.99
  6. Step 6: Final answer
    x = 92,398.21

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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.