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Finding the Fourth Proportional to 391,644.51, 587,471.89 and 125,405

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Solution

The fourth proportional to 391,644.51, 587,471.89 and 125,405 is: 188,109.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,644.51 : 587,471.89 = 125,405 : x
  2. Step 2: Convert to fraction form
    391,644.51/587,471.89 = 125,405/x
  3. Step 3: Cross multiply
    391,644.51x = 587,471.89 × 125,405
  4. Step 4: Simplify right side
    391,644.51x = 73,671,912,365.45
  5. Step 5: Solve for x
    x = 73,671,912,365.45/391,644.51
  6. Step 6: Final answer
    x = 188,109.14

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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.