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Finding the Fourth Proportional to 320.79, 480.81 and 147.30

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Solution

The fourth proportional to 320.79, 480.81 and 147.30 is: 220.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.79 : 480.81 = 147.30 : x
  2. Step 2: Convert to fraction form
    320.79/480.81 = 147.30/x
  3. Step 3: Cross multiply
    320.79x = 480.81 × 147.30
  4. Step 4: Simplify right side
    320.79x = 70,823.31
  5. Step 5: Solve for x
    x = 70,823.31/320.79
  6. Step 6: Final answer
    x = 220.78

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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.