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Finding the Fourth Proportional to 399,070.23, 550,728.53 and 217,793.82

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Solution

The fourth proportional to 399,070.23, 550,728.53 and 217,793.82 is: 300,561.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,070.23 : 550,728.53 = 217,793.82 : x
  2. Step 2: Convert to fraction form
    399,070.23/550,728.53 = 217,793.82/x
  3. Step 3: Cross multiply
    399,070.23x = 550,728.53 × 217,793.82
  4. Step 4: Simplify right side
    399,070.23x = 119,945,270,331.69
  5. Step 5: Solve for x
    x = 119,945,270,331.69/399,070.23
  6. Step 6: Final answer
    x = 300,561.81

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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.