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Finding the Fourth Proportional to 391,879, 587,901.66 and 125,826.40

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Solution

The fourth proportional to 391,879, 587,901.66 and 125,826.40 is: 188,766.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,879 : 587,901.66 = 125,826.40 : x
  2. Step 2: Convert to fraction form
    391,879/587,901.66 = 125,826.40/x
  3. Step 3: Cross multiply
    391,879x = 587,901.66 × 125,826.40
  4. Step 4: Simplify right side
    391,879x = 73,973,549,431.82
  5. Step 5: Solve for x
    x = 73,973,549,431.82/391,879
  6. Step 6: Final answer
    x = 188,766.30

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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.