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Finding the Fourth Proportional to 394,305.70, 591,458.55 and 216,721.30

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Solution

The fourth proportional to 394,305.70, 591,458.55 and 216,721.30 is: 325,081.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,305.70 : 591,458.55 = 216,721.30 : x
  2. Step 2: Convert to fraction form
    394,305.70/591,458.55 = 216,721.30/x
  3. Step 3: Cross multiply
    394,305.70x = 591,458.55 × 216,721.30
  4. Step 4: Simplify right side
    394,305.70x = 128,181,665,852.12
  5. Step 5: Solve for x
    x = 128,181,665,852.12/394,305.70
  6. Step 6: Final answer
    x = 325,081.95

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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.