Home / 138,143.58-207,215.34-91,385.52

Finding the Fourth Proportional to 138,143.58, 207,215.34 and 91,385.52

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Solution

The fourth proportional to 138,143.58, 207,215.34 and 91,385.52 is: 137,078.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,143.58 : 207,215.34 = 91,385.52 : x
  2. Step 2: Convert to fraction form
    138,143.58/207,215.34 = 91,385.52/x
  3. Step 3: Cross multiply
    138,143.58x = 207,215.34 × 91,385.52
  4. Step 4: Simplify right side
    138,143.58x = 18,936,481,597.88
  5. Step 5: Solve for x
    x = 18,936,481,597.88/138,143.58
  6. Step 6: Final answer
    x = 137,078.26

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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.