Home / 138,649.96-191,336.38-78,220.60

Finding the Fourth Proportional to 138,649.96, 191,336.38 and 78,220.60

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Solution

The fourth proportional to 138,649.96, 191,336.38 and 78,220.60 is: 107,944.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,649.96 : 191,336.38 = 78,220.60 : x
  2. Step 2: Convert to fraction form
    138,649.96/191,336.38 = 78,220.60/x
  3. Step 3: Cross multiply
    138,649.96x = 191,336.38 × 78,220.60
  4. Step 4: Simplify right side
    138,649.96x = 14,966,446,445.43
  5. Step 5: Solve for x
    x = 14,966,446,445.43/138,649.96
  6. Step 6: Final answer
    x = 107,944.11

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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.