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Finding the Fourth Proportional to 105,721.70, 158,609.55 and 74,617.70

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Solution

The fourth proportional to 105,721.70, 158,609.55 and 74,617.70 is: 111,945.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,721.70 : 158,609.55 = 74,617.70 : x
  2. Step 2: Convert to fraction form
    105,721.70/158,609.55 = 74,617.70/x
  3. Step 3: Cross multiply
    105,721.70x = 158,609.55 × 74,617.70
  4. Step 4: Simplify right side
    105,721.70x = 11,835,079,819.04
  5. Step 5: Solve for x
    x = 11,835,079,819.04/105,721.70
  6. Step 6: Final answer
    x = 111,945.61

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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.