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Finding the Fourth Proportional to 715,857.13, 987,857.43 and 393,564.71

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Solution

The fourth proportional to 715,857.13, 987,857.43 and 393,564.71 is: 543,105.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,857.13 : 987,857.43 = 393,564.71 : x
  2. Step 2: Convert to fraction form
    715,857.13/987,857.43 = 393,564.71/x
  3. Step 3: Cross multiply
    715,857.13x = 987,857.43 × 393,564.71
  4. Step 4: Simplify right side
    715,857.13x = 388,785,822,959.30
  5. Step 5: Solve for x
    x = 388,785,822,959.30/715,857.13
  6. Step 6: Final answer
    x = 543,105.33

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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.