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Finding the Fourth Proportional to 320.80, 480.87 and 125.53

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Solution

The fourth proportional to 320.80, 480.87 and 125.53 is: 188.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.80 : 480.87 = 125.53 : x
  2. Step 2: Convert to fraction form
    320.80/480.87 = 125.53/x
  3. Step 3: Cross multiply
    320.80x = 480.87 × 125.53
  4. Step 4: Simplify right side
    320.80x = 60,362.72
  5. Step 5: Solve for x
    x = 60,362.72/320.80
  6. Step 6: Final answer
    x = 188.17

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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.