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Finding the Fourth Proportional to 481.25, 663.88 and 315.47

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Solution

The fourth proportional to 481.25, 663.88 and 315.47 is: 435.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.25 : 663.88 = 315.47 : x
  2. Step 2: Convert to fraction form
    481.25/663.88 = 315.47/x
  3. Step 3: Cross multiply
    481.25x = 663.88 × 315.47
  4. Step 4: Simplify right side
    481.25x = 209,434.22
  5. Step 5: Solve for x
    x = 209,434.22/481.25
  6. Step 6: Final answer
    x = 435.19

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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.