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Finding the Fourth Proportional to 320.25, 480.38 and 89.15

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Solution

The fourth proportional to 320.25, 480.38 and 89.15 is: 133.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.25 : 480.38 = 89.15 : x
  2. Step 2: Convert to fraction form
    320.25/480.38 = 89.15/x
  3. Step 3: Cross multiply
    320.25x = 480.38 × 89.15
  4. Step 4: Simplify right side
    320.25x = 42,828.03
  5. Step 5: Solve for x
    x = 42,828.03/320.25
  6. Step 6: Final answer
    x = 133.73

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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.