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Finding the Fourth Proportional to 709,399.18, 978,991.63 and 387,130.05

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Solution

The fourth proportional to 709,399.18, 978,991.63 and 387,130.05 is: 534,250.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,399.18 : 978,991.63 = 387,130.05 : x
  2. Step 2: Convert to fraction form
    709,399.18/978,991.63 = 387,130.05/x
  3. Step 3: Cross multiply
    709,399.18x = 978,991.63 × 387,130.05
  4. Step 4: Simplify right side
    709,399.18x = 378,997,073,776.52
  5. Step 5: Solve for x
    x = 378,997,073,776.52/709,399.18
  6. Step 6: Final answer
    x = 534,250.80

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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.