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Finding the Fourth Proportional to 481.50, 721.40 and 307.76

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Solution

The fourth proportional to 481.50, 721.40 and 307.76 is: 461.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.50 : 721.40 = 307.76 : x
  2. Step 2: Convert to fraction form
    481.50/721.40 = 307.76/x
  3. Step 3: Cross multiply
    481.50x = 721.40 × 307.76
  4. Step 4: Simplify right side
    481.50x = 222,012.92
  5. Step 5: Solve for x
    x = 222,012.92/481.50
  6. Step 6: Final answer
    x = 461.09

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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.