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Finding the Fourth Proportional to 709,355.18, 978,933.78 and 387,082.96

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Solution

The fourth proportional to 709,355.18, 978,933.78 and 387,082.96 is: 534,187.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,355.18 : 978,933.78 = 387,082.96 : x
  2. Step 2: Convert to fraction form
    709,355.18/978,933.78 = 387,082.96/x
  3. Step 3: Cross multiply
    709,355.18x = 978,933.78 × 387,082.96
  4. Step 4: Simplify right side
    709,355.18x = 378,928,582,759.05
  5. Step 5: Solve for x
    x = 378,928,582,759.05/709,355.18
  6. Step 6: Final answer
    x = 534,187.37

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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.