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Finding the Fourth Proportional to 401.25, 553.64 and 243.91

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Solution

The fourth proportional to 401.25, 553.64 and 243.91 is: 336.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.25 : 553.64 = 243.91 : x
  2. Step 2: Convert to fraction form
    401.25/553.64 = 243.91/x
  3. Step 3: Cross multiply
    401.25x = 553.64 × 243.91
  4. Step 4: Simplify right side
    401.25x = 135,037.80
  5. Step 5: Solve for x
    x = 135,037.80/401.25
  6. Step 6: Final answer
    x = 336.54

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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.