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Finding the Fourth Proportional to 353.53, 487.93 and 220.81

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Solution

The fourth proportional to 353.53, 487.93 and 220.81 is: 304.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.53 : 487.93 = 220.81 : x
  2. Step 2: Convert to fraction form
    353.53/487.93 = 220.81/x
  3. Step 3: Cross multiply
    353.53x = 487.93 × 220.81
  4. Step 4: Simplify right side
    353.53x = 107,737.38
  5. Step 5: Solve for x
    x = 107,737.38/353.53
  6. Step 6: Final answer
    x = 304.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.