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Finding the Fourth Proportional to 159,991.20, 220,805.28 and 92,011.68

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Solution

The fourth proportional to 159,991.20, 220,805.28 and 92,011.68 is: 126,986.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,991.20 : 220,805.28 = 92,011.68 : x
  2. Step 2: Convert to fraction form
    159,991.20/220,805.28 = 92,011.68/x
  3. Step 3: Cross multiply
    159,991.20x = 220,805.28 × 92,011.68
  4. Step 4: Simplify right side
    159,991.20x = 20,316,664,765.67
  5. Step 5: Solve for x
    x = 20,316,664,765.67/159,991.20
  6. Step 6: Final answer
    x = 126,986.14

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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.