Home / 138,542.18-191,184.37-78,112.28

Finding the Fourth Proportional to 138,542.18, 191,184.37 and 78,112.28

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Solution

The fourth proportional to 138,542.18, 191,184.37 and 78,112.28 is: 107,792.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,542.18 : 191,184.37 = 78,112.28 : x
  2. Step 2: Convert to fraction form
    138,542.18/191,184.37 = 78,112.28/x
  3. Step 3: Cross multiply
    138,542.18x = 191,184.37 × 78,112.28
  4. Step 4: Simplify right side
    138,542.18x = 14,933,847,323.74
  5. Step 5: Solve for x
    x = 14,933,847,323.74/138,542.18
  6. Step 6: Final answer
    x = 107,792.79

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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.