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Finding the Fourth Proportional to 391,278.66, 587,513.94 and 372,011.54

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Solution

The fourth proportional to 391,278.66, 587,513.94 and 372,011.54 is: 558,583.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,278.66 : 587,513.94 = 372,011.54 : x
  2. Step 2: Convert to fraction form
    391,278.66/587,513.94 = 372,011.54/x
  3. Step 3: Cross multiply
    391,278.66x = 587,513.94 × 372,011.54
  4. Step 4: Simplify right side
    391,278.66x = 218,561,965,590.87
  5. Step 5: Solve for x
    x = 218,561,965,590.87/391,278.66
  6. Step 6: Final answer
    x = 558,583.91

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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.