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Finding the Fourth Proportional to 480.81, 663.21 and 315.26

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Solution

The fourth proportional to 480.81, 663.21 and 315.26 is: 434.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.81 : 663.21 = 315.26 : x
  2. Step 2: Convert to fraction form
    480.81/663.21 = 315.26/x
  3. Step 3: Cross multiply
    480.81x = 663.21 × 315.26
  4. Step 4: Simplify right side
    480.81x = 209,080.27
  5. Step 5: Solve for x
    x = 209,080.27/480.81
  6. Step 6: Final answer
    x = 434.85

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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.