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Finding the Fourth Proportional to 126,876.70, 190,315.05 and 115,212.70

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Solution

The fourth proportional to 126,876.70, 190,315.05 and 115,212.70 is: 172,819.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,876.70 : 190,315.05 = 115,212.70 : x
  2. Step 2: Convert to fraction form
    126,876.70/190,315.05 = 115,212.70/x
  3. Step 3: Cross multiply
    126,876.70x = 190,315.05 × 115,212.70
  4. Step 4: Simplify right side
    126,876.70x = 21,926,710,761.14
  5. Step 5: Solve for x
    x = 21,926,710,761.14/126,876.70
  6. Step 6: Final answer
    x = 172,819.05

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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.