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Finding the Fourth Proportional to 709,365.60, 978,906.06 and 387,079.56

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Solution

The fourth proportional to 709,365.60, 978,906.06 and 387,079.56 is: 534,159.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,365.60 : 978,906.06 = 387,079.56 : x
  2. Step 2: Convert to fraction form
    709,365.60/978,906.06 = 387,079.56/x
  3. Step 3: Cross multiply
    709,365.60x = 978,906.06 × 387,079.56
  4. Step 4: Simplify right side
    709,365.60x = 378,914,526,986.13
  5. Step 5: Solve for x
    x = 378,914,526,986.13/709,365.60
  6. Step 6: Final answer
    x = 534,159.72

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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.