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Finding the Fourth Proportional to 709,359.44, 978,939.64 and 387,087.20

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Solution

The fourth proportional to 709,359.44, 978,939.64 and 387,087.20 is: 534,193.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,359.44 : 978,939.64 = 387,087.20 : x
  2. Step 2: Convert to fraction form
    709,359.44/978,939.64 = 387,087.20/x
  3. Step 3: Cross multiply
    709,359.44x = 978,939.64 × 387,087.20
  4. Step 4: Simplify right side
    709,359.44x = 378,935,004,216.61
  5. Step 5: Solve for x
    x = 378,935,004,216.61/709,359.44
  6. Step 6: Final answer
    x = 534,193.22

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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.