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Finding the Fourth Proportional to 320.68, 480.58 and 147.17

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Solution

The fourth proportional to 320.68, 480.58 and 147.17 is: 220.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.68 : 480.58 = 147.17 : x
  2. Step 2: Convert to fraction form
    320.68/480.58 = 147.17/x
  3. Step 3: Cross multiply
    320.68x = 480.58 × 147.17
  4. Step 4: Simplify right side
    320.68x = 70,725.92
  5. Step 5: Solve for x
    x = 70,725.92/320.68
  6. Step 6: Final answer
    x = 220.55

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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.