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Finding the Fourth Proportional to 481.76, 721.84 and 433.28

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Solution

The fourth proportional to 481.76, 721.84 and 433.28 is: 649.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.76 : 721.84 = 433.28 : x
  2. Step 2: Convert to fraction form
    481.76/721.84 = 433.28/x
  3. Step 3: Cross multiply
    481.76x = 721.84 × 433.28
  4. Step 4: Simplify right side
    481.76x = 312,758.84
  5. Step 5: Solve for x
    x = 312,758.84/481.76
  6. Step 6: Final answer
    x = 649.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.