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Finding the Fourth Proportional to 709,388.11, 978,958.11 and 387,105.31

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Solution

The fourth proportional to 709,388.11, 978,958.11 and 387,105.31 is: 534,206.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,388.11 : 978,958.11 = 387,105.31 : x
  2. Step 2: Convert to fraction form
    709,388.11/978,958.11 = 387,105.31/x
  3. Step 3: Cross multiply
    709,388.11x = 978,958.11 × 387,105.31
  4. Step 4: Simplify right side
    709,388.11x = 378,959,882,648.56
  5. Step 5: Solve for x
    x = 378,959,882,648.56/709,388.11
  6. Step 6: Final answer
    x = 534,206.70

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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.