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Finding the Fourth Proportional to 391,579.45, 587,081.89 and 125,186.65

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Solution

The fourth proportional to 391,579.45, 587,081.89 and 125,186.65 is: 187,688.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,579.45 : 587,081.89 = 125,186.65 : x
  2. Step 2: Convert to fraction form
    391,579.45/587,081.89 = 125,186.65/x
  3. Step 3: Cross multiply
    391,579.45x = 587,081.89 × 125,186.65
  4. Step 4: Simplify right side
    391,579.45x = 73,494,815,084.77
  5. Step 5: Solve for x
    x = 73,494,815,084.77/391,579.45
  6. Step 6: Final answer
    x = 187,688.13

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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.