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Finding the Fourth Proportional to 353.59, 487.80 and 220.78

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Solution

The fourth proportional to 353.59, 487.80 and 220.78 is: 304.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.59 : 487.80 = 220.78 : x
  2. Step 2: Convert to fraction form
    353.59/487.80 = 220.78/x
  3. Step 3: Cross multiply
    353.59x = 487.80 × 220.78
  4. Step 4: Simplify right side
    353.59x = 107,696.48
  5. Step 5: Solve for x
    x = 107,696.48/353.59
  6. Step 6: Final answer
    x = 304.58

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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.