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Finding the Fourth Proportional to 480.81, 721.21 and 156.19

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Solution

The fourth proportional to 480.81, 721.21 and 156.19 is: 234.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.81 : 721.21 = 156.19 : x
  2. Step 2: Convert to fraction form
    480.81/721.21 = 156.19/x
  3. Step 3: Cross multiply
    480.81x = 721.21 × 156.19
  4. Step 4: Simplify right side
    480.81x = 112,645.79
  5. Step 5: Solve for x
    x = 112,645.79/480.81
  6. Step 6: Final answer
    x = 234.28

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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.