Home / 138,291.18-207,427.05-78,940.86

Finding the Fourth Proportional to 138,291.18, 207,427.05 and 78,940.86

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Solution

The fourth proportional to 138,291.18, 207,427.05 and 78,940.86 is: 118,405.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,291.18 : 207,427.05 = 78,940.86 : x
  2. Step 2: Convert to fraction form
    138,291.18/207,427.05 = 78,940.86/x
  3. Step 3: Cross multiply
    138,291.18x = 207,427.05 × 78,940.86
  4. Step 4: Simplify right side
    138,291.18x = 16,374,469,714.26
  5. Step 5: Solve for x
    x = 16,374,469,714.26/138,291.18
  6. Step 6: Final answer
    x = 118,405.74

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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.