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Finding the Fourth Proportional to 709,363.43, 978,945.17 and 387,091.21

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Solution

The fourth proportional to 709,363.43, 978,945.17 and 387,091.21 is: 534,198.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,363.43 : 978,945.17 = 387,091.21 : x
  2. Step 2: Convert to fraction form
    709,363.43/978,945.17 = 387,091.21/x
  3. Step 3: Cross multiply
    709,363.43x = 978,945.17 × 387,091.21
  4. Step 4: Simplify right side
    709,363.43x = 378,941,074,123.19
  5. Step 5: Solve for x
    x = 378,941,074,123.19/709,363.43
  6. Step 6: Final answer
    x = 534,198.77

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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.