Home / 131,876.91-181,929.81-78,131.37

Finding the Fourth Proportional to 131,876.91, 181,929.81 and 78,131.37

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Solution

The fourth proportional to 131,876.91, 181,929.81 and 78,131.37 is: 107,785.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,876.91 : 181,929.81 = 78,131.37 : x
  2. Step 2: Convert to fraction form
    131,876.91/181,929.81 = 78,131.37/x
  3. Step 3: Cross multiply
    131,876.91x = 181,929.81 × 78,131.37
  4. Step 4: Simplify right side
    131,876.91x = 14,214,425,299.14
  5. Step 5: Solve for x
    x = 14,214,425,299.14/131,876.91
  6. Step 6: Final answer
    x = 107,785.55

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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.