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Finding the Fourth Proportional to 398,826.61, 550,382.45 and 217,542.43

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Solution

The fourth proportional to 398,826.61, 550,382.45 and 217,542.43 is: 300,209.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,826.61 : 550,382.45 = 217,542.43 : x
  2. Step 2: Convert to fraction form
    398,826.61/550,382.45 = 217,542.43/x
  3. Step 3: Cross multiply
    398,826.61x = 550,382.45 × 217,542.43
  4. Step 4: Simplify right side
    398,826.61x = 119,731,535,602.35
  5. Step 5: Solve for x
    x = 119,731,535,602.35/398,826.61
  6. Step 6: Final answer
    x = 300,209.50

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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.