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Finding the Fourth Proportional to 480.81, 721.30 and 156.12

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Solution

The fourth proportional to 480.81, 721.30 and 156.12 is: 234.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.81 : 721.30 = 156.12 : x
  2. Step 2: Convert to fraction form
    480.81/721.30 = 156.12/x
  3. Step 3: Cross multiply
    480.81x = 721.30 × 156.12
  4. Step 4: Simplify right side
    480.81x = 112,609.36
  5. Step 5: Solve for x
    x = 112,609.36/480.81
  6. Step 6: Final answer
    x = 234.21

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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.