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Finding the Fourth Proportional to 381,617.80, 571,937.10 and 213,137.80

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Solution

The fourth proportional to 381,617.80, 571,937.10 and 213,137.80 is: 319,433.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,617.80 : 571,937.10 = 213,137.80 : x
  2. Step 2: Convert to fraction form
    381,617.80/571,937.10 = 213,137.80/x
  3. Step 3: Cross multiply
    381,617.80x = 571,937.10 × 213,137.80
  4. Step 4: Simplify right side
    381,617.80x = 121,901,415,232.38
  5. Step 5: Solve for x
    x = 121,901,415,232.38/381,617.80
  6. Step 6: Final answer
    x = 319,433.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.