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Finding the Fourth Proportional to 709,400.43, 978,993.36 and 387,131.30

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Solution

The fourth proportional to 709,400.43, 978,993.36 and 387,131.30 is: 534,252.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,400.43 : 978,993.36 = 387,131.30 : x
  2. Step 2: Convert to fraction form
    709,400.43/978,993.36 = 387,131.30/x
  3. Step 3: Cross multiply
    709,400.43x = 978,993.36 × 387,131.30
  4. Step 4: Simplify right side
    709,400.43x = 378,998,972,148.17
  5. Step 5: Solve for x
    x = 378,998,972,148.17/709,400.43
  6. Step 6: Final answer
    x = 534,252.53

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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.