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Finding the Fourth Proportional to 709,399.43, 978,991.98 and 387,130.30

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Solution

The fourth proportional to 709,399.43, 978,991.98 and 387,130.30 is: 534,251.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,399.43 : 978,991.98 = 387,130.30 : x
  2. Step 2: Convert to fraction form
    709,399.43/978,991.98 = 387,130.30/x
  3. Step 3: Cross multiply
    709,399.43x = 978,991.98 × 387,130.30
  4. Step 4: Simplify right side
    709,399.43x = 378,997,456,467.51
  5. Step 5: Solve for x
    x = 378,997,456,467.51/709,399.43
  6. Step 6: Final answer
    x = 534,251.15

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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.