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Finding the Fourth Proportional to 399,370, 551,131.55 and 218,082.28

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Solution

The fourth proportional to 399,370, 551,131.55 and 218,082.28 is: 300,954.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,370 : 551,131.55 = 218,082.28 : x
  2. Step 2: Convert to fraction form
    399,370/551,131.55 = 218,082.28/x
  3. Step 3: Cross multiply
    399,370x = 551,131.55 × 218,082.28
  4. Step 4: Simplify right side
    399,370x = 120,192,025,003.93
  5. Step 5: Solve for x
    x = 120,192,025,003.93/399,370
  6. Step 6: Final answer
    x = 300,954.07

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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.