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Finding the Fourth Proportional to 219.87, 331.55 and 215.76

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Solution

The fourth proportional to 219.87, 331.55 and 215.76 is: 325.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    219.87 : 331.55 = 215.76 : x
  2. Step 2: Convert to fraction form
    219.87/331.55 = 215.76/x
  3. Step 3: Cross multiply
    219.87x = 331.55 × 215.76
  4. Step 4: Simplify right side
    219.87x = 71,534.15
  5. Step 5: Solve for x
    x = 71,534.15/219.87
  6. Step 6: Final answer
    x = 325.35

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.