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Finding the Fourth Proportional to 391,439.88, 587,385.84 and 211,525.92

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Solution

The fourth proportional to 391,439.88, 587,385.84 and 211,525.92 is: 317,411.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,439.88 : 587,385.84 = 211,525.92 : x
  2. Step 2: Convert to fraction form
    391,439.88/587,385.84 = 211,525.92/x
  3. Step 3: Cross multiply
    391,439.88x = 587,385.84 × 211,525.92
  4. Step 4: Simplify right side
    391,439.88x = 124,247,330,200.97
  5. Step 5: Solve for x
    x = 124,247,330,200.97/391,439.88
  6. Step 6: Final answer
    x = 317,411.02

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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.