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Finding the Fourth Proportional to 399,089.54, 550,745.21 and 217,805.31

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Solution

The fourth proportional to 399,089.54, 550,745.21 and 217,805.31 is: 300,572.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,089.54 : 550,745.21 = 217,805.31 : x
  2. Step 2: Convert to fraction form
    399,089.54/550,745.21 = 217,805.31/x
  3. Step 3: Cross multiply
    399,089.54x = 550,745.21 × 217,805.31
  4. Step 4: Simplify right side
    399,089.54x = 119,955,231,195.07
  5. Step 5: Solve for x
    x = 119,955,231,195.07/399,089.54
  6. Step 6: Final answer
    x = 300,572.23

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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.