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Finding the Fourth Proportional to 353.62, 487.77 and 215.62

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Solution

The fourth proportional to 353.62, 487.77 and 215.62 is: 297.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    353.62 : 487.77 = 215.62 : x
  2. Step 2: Convert to fraction form
    353.62/487.77 = 215.62/x
  3. Step 3: Cross multiply
    353.62x = 487.77 × 215.62
  4. Step 4: Simplify right side
    353.62x = 105,172.97
  5. Step 5: Solve for x
    x = 105,172.97/353.62
  6. Step 6: Final answer
    x = 297.42

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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.