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Finding the Fourth Proportional to 138,765.68, 191,579.15 and 91,102.58

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Solution

The fourth proportional to 138,765.68, 191,579.15 and 91,102.58 is: 125,775.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,765.68 : 191,579.15 = 91,102.58 : x
  2. Step 2: Convert to fraction form
    138,765.68/191,579.15 = 91,102.58/x
  3. Step 3: Cross multiply
    138,765.68x = 191,579.15 × 91,102.58
  4. Step 4: Simplify right side
    138,765.68x = 17,453,354,839.21
  5. Step 5: Solve for x
    x = 17,453,354,839.21/138,765.68
  6. Step 6: Final answer
    x = 125,775.73

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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.