Home / 138,083.72-207,085.26-78,908.36

Finding the Fourth Proportional to 138,083.72, 207,085.26 and 78,908.36

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Solution

The fourth proportional to 138,083.72, 207,085.26 and 78,908.36 is: 118,339.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,083.72 : 207,085.26 = 78,908.36 : x
  2. Step 2: Convert to fraction form
    138,083.72/207,085.26 = 78,908.36/x
  3. Step 3: Cross multiply
    138,083.72x = 207,085.26 × 78,908.36
  4. Step 4: Simplify right side
    138,083.72x = 16,340,758,246.77
  5. Step 5: Solve for x
    x = 16,340,758,246.77/138,083.72
  6. Step 6: Final answer
    x = 118,339.50

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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.