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Finding the Fourth Proportional to 709,389.11, 978,959.49 and 387,106.31

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Solution

The fourth proportional to 709,389.11, 978,959.49 and 387,106.31 is: 534,208.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,389.11 : 978,959.49 = 387,106.31 : x
  2. Step 2: Convert to fraction form
    709,389.11/978,959.49 = 387,106.31/x
  3. Step 3: Cross multiply
    709,389.11x = 978,959.49 × 387,106.31
  4. Step 4: Simplify right side
    709,389.11x = 378,961,395,813.38
  5. Step 5: Solve for x
    x = 378,961,395,813.38/709,389.11
  6. Step 6: Final answer
    x = 534,208.08

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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.