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Finding the Fourth Proportional to 636,813.72, 878,437.98 and 397,935

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Solution

The fourth proportional to 636,813.72, 878,437.98 and 397,935 is: 548,922.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    636,813.72 : 878,437.98 = 397,935 : x
  2. Step 2: Convert to fraction form
    636,813.72/878,437.98 = 397,935/x
  3. Step 3: Cross multiply
    636,813.72x = 878,437.98 × 397,935
  4. Step 4: Simplify right side
    636,813.72x = 349,561,217,571.30
  5. Step 5: Solve for x
    x = 349,561,217,571.30/636,813.72
  6. Step 6: Final answer
    x = 548,922.25

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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.