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Finding the Fourth Proportional to 398,913.88, 550,490.23 and 217,625.76

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Solution

The fourth proportional to 398,913.88, 550,490.23 and 217,625.76 is: 300,317.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,913.88 : 550,490.23 = 217,625.76 : x
  2. Step 2: Convert to fraction form
    398,913.88/550,490.23 = 217,625.76/x
  3. Step 3: Cross multiply
    398,913.88x = 550,490.23 × 217,625.76
  4. Step 4: Simplify right side
    398,913.88x = 119,800,853,724.21
  5. Step 5: Solve for x
    x = 119,800,853,724.21/398,913.88
  6. Step 6: Final answer
    x = 300,317.59

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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.