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Finding the Fourth Proportional to 417.28, 576 and 242.88

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Solution

The fourth proportional to 417.28, 576 and 242.88 is: 335.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.28 : 576 = 242.88 : x
  2. Step 2: Convert to fraction form
    417.28/576 = 242.88/x
  3. Step 3: Cross multiply
    417.28x = 576 × 242.88
  4. Step 4: Simplify right side
    417.28x = 139,898.88
  5. Step 5: Solve for x
    x = 139,898.88/417.28
  6. Step 6: Final answer
    x = 335.26

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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.