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Finding the Fourth Proportional to 393,067.80, 589,601.70 and 215,920.80

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Solution

The fourth proportional to 393,067.80, 589,601.70 and 215,920.80 is: 323,881.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,067.80 : 589,601.70 = 215,920.80 : x
  2. Step 2: Convert to fraction form
    393,067.80/589,601.70 = 215,920.80/x
  3. Step 3: Cross multiply
    393,067.80x = 589,601.70 × 215,920.80
  4. Step 4: Simplify right side
    393,067.80x = 127,307,270,745.36
  5. Step 5: Solve for x
    x = 127,307,270,745.36/393,067.80
  6. Step 6: Final answer
    x = 323,881.20

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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.