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Finding the Fourth Proportional to 481.68, 663.12 and 407.88

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Solution

The fourth proportional to 481.68, 663.12 and 407.88 is: 561.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.68 : 663.12 = 407.88 : x
  2. Step 2: Convert to fraction form
    481.68/663.12 = 407.88/x
  3. Step 3: Cross multiply
    481.68x = 663.12 × 407.88
  4. Step 4: Simplify right side
    481.68x = 270,473.39
  5. Step 5: Solve for x
    x = 270,473.39/481.68
  6. Step 6: Final answer
    x = 561.52

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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.