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Finding the Fourth Proportional to 320.55, 480.42 and 217.58

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Solution

The fourth proportional to 320.55, 480.42 and 217.58 is: 326.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.55 : 480.42 = 217.58 : x
  2. Step 2: Convert to fraction form
    320.55/480.42 = 217.58/x
  3. Step 3: Cross multiply
    320.55x = 480.42 × 217.58
  4. Step 4: Simplify right side
    320.55x = 104,529.78
  5. Step 5: Solve for x
    x = 104,529.78/320.55
  6. Step 6: Final answer
    x = 326.10

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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.