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Finding the Fourth Proportional to 401.28, 553.72 and 224.22

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Solution

The fourth proportional to 401.28, 553.72 and 224.22 is: 309.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.28 : 553.72 = 224.22 : x
  2. Step 2: Convert to fraction form
    401.28/553.72 = 224.22/x
  3. Step 3: Cross multiply
    401.28x = 553.72 × 224.22
  4. Step 4: Simplify right side
    401.28x = 124,155.10
  5. Step 5: Solve for x
    x = 124,155.10/401.28
  6. Step 6: Final answer
    x = 309.40

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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.