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Finding the Fourth Proportional to 394,711.80, 591,630.30 and 217,346.10

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Solution

The fourth proportional to 394,711.80, 591,630.30 and 217,346.10 is: 325,778.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,711.80 : 591,630.30 = 217,346.10 : x
  2. Step 2: Convert to fraction form
    394,711.80/591,630.30 = 217,346.10/x
  3. Step 3: Cross multiply
    394,711.80x = 591,630.30 × 217,346.10
  4. Step 4: Simplify right side
    394,711.80x = 128,588,538,346.83
  5. Step 5: Solve for x
    x = 128,588,538,346.83/394,711.80
  6. Step 6: Final answer
    x = 325,778.30

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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.