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Finding the Fourth Proportional to 391,725.31, 587,672.56 and 121,848.31

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Solution

The fourth proportional to 391,725.31, 587,672.56 and 121,848.31 is: 182,798.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,725.31 : 587,672.56 = 121,848.31 : x
  2. Step 2: Convert to fraction form
    391,725.31/587,672.56 = 121,848.31/x
  3. Step 3: Cross multiply
    391,725.31x = 587,672.56 × 121,848.31
  4. Step 4: Simplify right side
    391,725.31x = 71,606,907,660.13
  5. Step 5: Solve for x
    x = 71,606,907,660.13/391,725.31
  6. Step 6: Final answer
    x = 182,798.78

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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.