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Finding the Fourth Proportional to 289.28, 397.36 and 285.24

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Solution

The fourth proportional to 289.28, 397.36 and 285.24 is: 391.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.28 : 397.36 = 285.24 : x
  2. Step 2: Convert to fraction form
    289.28/397.36 = 285.24/x
  3. Step 3: Cross multiply
    289.28x = 397.36 × 285.24
  4. Step 4: Simplify right side
    289.28x = 113,342.97
  5. Step 5: Solve for x
    x = 113,342.97/289.28
  6. Step 6: Final answer
    x = 391.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.