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Finding the Fourth Proportional to 399,009.88, 550,655.92 and 217,724.90

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Solution

The fourth proportional to 399,009.88, 550,655.92 and 217,724.90 is: 300,472.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,009.88 : 550,655.92 = 217,724.90 : x
  2. Step 2: Convert to fraction form
    399,009.88/550,655.92 = 217,724.90/x
  3. Step 3: Cross multiply
    399,009.88x = 550,655.92 × 217,724.90
  4. Step 4: Simplify right side
    399,009.88x = 119,891,502,635.29
  5. Step 5: Solve for x
    x = 119,891,502,635.29/399,009.88
  6. Step 6: Final answer
    x = 300,472.52

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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.