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Finding the Fourth Proportional to 401.74, 601.36 and 279.64

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Solution

The fourth proportional to 401.74, 601.36 and 279.64 is: 418.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.74 : 601.36 = 279.64 : x
  2. Step 2: Convert to fraction form
    401.74/601.36 = 279.64/x
  3. Step 3: Cross multiply
    401.74x = 601.36 × 279.64
  4. Step 4: Simplify right side
    401.74x = 168,164.31
  5. Step 5: Solve for x
    x = 168,164.31/401.74
  6. Step 6: Final answer
    x = 418.59

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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.