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Finding the Fourth Proportional to 611.60, 843.78 and 401.72

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Solution

The fourth proportional to 611.60, 843.78 and 401.72 is: 554.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.60 : 843.78 = 401.72 : x
  2. Step 2: Convert to fraction form
    611.60/843.78 = 401.72/x
  3. Step 3: Cross multiply
    611.60x = 843.78 × 401.72
  4. Step 4: Simplify right side
    611.60x = 338,963.30
  5. Step 5: Solve for x
    x = 338,963.30/611.60
  6. Step 6: Final answer
    x = 554.22

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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.