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Finding the Fourth Proportional to 107,851.20, 161,776.80 and 100,939.20

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Solution

The fourth proportional to 107,851.20, 161,776.80 and 100,939.20 is: 151,408.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,851.20 : 161,776.80 = 100,939.20 : x
  2. Step 2: Convert to fraction form
    107,851.20/161,776.80 = 100,939.20/x
  3. Step 3: Cross multiply
    107,851.20x = 161,776.80 × 100,939.20
  4. Step 4: Simplify right side
    107,851.20x = 16,329,620,770.56
  5. Step 5: Solve for x
    x = 16,329,620,770.56/107,851.20
  6. Step 6: Final answer
    x = 151,408.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.