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Finding the Fourth Proportional to 447.78, 617.78 and 290.61

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Solution

The fourth proportional to 447.78, 617.78 and 290.61 is: 400.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.78 : 617.78 = 290.61 : x
  2. Step 2: Convert to fraction form
    447.78/617.78 = 290.61/x
  3. Step 3: Cross multiply
    447.78x = 617.78 × 290.61
  4. Step 4: Simplify right side
    447.78x = 179,533.16
  5. Step 5: Solve for x
    x = 179,533.16/447.78
  6. Step 6: Final answer
    x = 400.94

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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.