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Finding the Fourth Proportional to 643,178.93, 887,469.56 and 371,147.57

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Solution

The fourth proportional to 643,178.93, 887,469.56 and 371,147.57 is: 512,115.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,178.93 : 887,469.56 = 371,147.57 : x
  2. Step 2: Convert to fraction form
    643,178.93/887,469.56 = 371,147.57/x
  3. Step 3: Cross multiply
    643,178.93x = 887,469.56 × 371,147.57
  4. Step 4: Simplify right side
    643,178.93x = 329,382,171,157.40
  5. Step 5: Solve for x
    x = 329,382,171,157.40/643,178.93
  6. Step 6: Final answer
    x = 512,115.92

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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.