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Finding the Fourth Proportional to 480.65, 720.78 and 168.21

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Solution

The fourth proportional to 480.65, 720.78 and 168.21 is: 252.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.65 : 720.78 = 168.21 : x
  2. Step 2: Convert to fraction form
    480.65/720.78 = 168.21/x
  3. Step 3: Cross multiply
    480.65x = 720.78 × 168.21
  4. Step 4: Simplify right side
    480.65x = 121,242.40
  5. Step 5: Solve for x
    x = 121,242.40/480.65
  6. Step 6: Final answer
    x = 252.25

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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.