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Finding the Fourth Proportional to 399,240, 550,951.20 and 220,393.28

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Solution

The fourth proportional to 399,240, 550,951.20 and 220,393.28 is: 304,142.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,240 : 550,951.20 = 220,393.28 : x
  2. Step 2: Convert to fraction form
    399,240/550,951.20 = 220,393.28/x
  3. Step 3: Cross multiply
    399,240x = 550,951.20 × 220,393.28
  4. Step 4: Simplify right side
    399,240x = 121,425,942,087.94
  5. Step 5: Solve for x
    x = 121,425,942,087.94/399,240
  6. Step 6: Final answer
    x = 304,142.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.