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Finding the Fourth Proportional to 159,406.39, 219,972.40 and 91,419.85

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Solution

The fourth proportional to 159,406.39, 219,972.40 and 91,419.85 is: 126,154.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,406.39 : 219,972.40 = 91,419.85 : x
  2. Step 2: Convert to fraction form
    159,406.39/219,972.40 = 91,419.85/x
  3. Step 3: Cross multiply
    159,406.39x = 219,972.40 × 91,419.85
  4. Step 4: Simplify right side
    159,406.39x = 20,109,843,812.14
  5. Step 5: Solve for x
    x = 20,109,843,812.14/159,406.39
  6. Step 6: Final answer
    x = 126,154.57

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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.