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Finding the Fourth Proportional to 481.26, 663.66 and 387.70

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Solution

The fourth proportional to 481.26, 663.66 and 387.70 is: 534.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.26 : 663.66 = 387.70 : x
  2. Step 2: Convert to fraction form
    481.26/663.66 = 387.70/x
  3. Step 3: Cross multiply
    481.26x = 663.66 × 387.70
  4. Step 4: Simplify right side
    481.26x = 257,303.06
  5. Step 5: Solve for x
    x = 257,303.06/481.26
  6. Step 6: Final answer
    x = 534.65

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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.