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Finding the Fourth Proportional to 678,078, 935,791.38 and 376,272

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Solution

The fourth proportional to 678,078, 935,791.38 and 376,272 is: 519,279.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,078 : 935,791.38 = 376,272 : x
  2. Step 2: Convert to fraction form
    678,078/935,791.38 = 376,272/x
  3. Step 3: Cross multiply
    678,078x = 935,791.38 × 376,272
  4. Step 4: Simplify right side
    678,078x = 352,112,094,135.36
  5. Step 5: Solve for x
    x = 352,112,094,135.36/678,078
  6. Step 6: Final answer
    x = 519,279.63

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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.