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Finding the Fourth Proportional to 398,800.78, 550,528.62 and 344,135.50

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Solution

The fourth proportional to 398,800.78, 550,528.62 and 344,135.50 is: 475,065.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,800.78 : 550,528.62 = 344,135.50 : x
  2. Step 2: Convert to fraction form
    398,800.78/550,528.62 = 344,135.50/x
  3. Step 3: Cross multiply
    398,800.78x = 550,528.62 × 344,135.50
  4. Step 4: Simplify right side
    398,800.78x = 189,456,441,908.01
  5. Step 5: Solve for x
    x = 189,456,441,908.01/398,800.78
  6. Step 6: Final answer
    x = 475,065.37

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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.