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Finding the Fourth Proportional to 401.02, 553.08 and 253.69

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Solution

The fourth proportional to 401.02, 553.08 and 253.69 is: 349.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.02 : 553.08 = 253.69 : x
  2. Step 2: Convert to fraction form
    401.02/553.08 = 253.69/x
  3. Step 3: Cross multiply
    401.02x = 553.08 × 253.69
  4. Step 4: Simplify right side
    401.02x = 140,310.87
  5. Step 5: Solve for x
    x = 140,310.87/401.02
  6. Step 6: Final answer
    x = 349.88

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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.