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Finding the Fourth Proportional to 611.74, 844.32 and 401.55

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Solution

The fourth proportional to 611.74, 844.32 and 401.55 is: 554.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.74 : 844.32 = 401.55 : x
  2. Step 2: Convert to fraction form
    611.74/844.32 = 401.55/x
  3. Step 3: Cross multiply
    611.74x = 844.32 × 401.55
  4. Step 4: Simplify right side
    611.74x = 339,036.70
  5. Step 5: Solve for x
    x = 339,036.70/611.74
  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.