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Finding the Fourth Proportional to 289.28, 399.60 and 224.60

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Solution

The fourth proportional to 289.28, 399.60 and 224.60 is: 310.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.28 : 399.60 = 224.60 : x
  2. Step 2: Convert to fraction form
    289.28/399.60 = 224.60/x
  3. Step 3: Cross multiply
    289.28x = 399.60 × 224.60
  4. Step 4: Simplify right side
    289.28x = 89,750.16
  5. Step 5: Solve for x
    x = 89,750.16/289.28
  6. Step 6: Final answer
    x = 310.25

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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.