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Finding the Fourth Proportional to 225, 310.56 and 216.12

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Solution

The fourth proportional to 225, 310.56 and 216.12 is: 298.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    225 : 310.56 = 216.12 : x
  2. Step 2: Convert to fraction form
    225/310.56 = 216.12/x
  3. Step 3: Cross multiply
    225x = 310.56 × 216.12
  4. Step 4: Simplify right side
    225x = 67,118.23
  5. Step 5: Solve for x
    x = 67,118.23/225
  6. Step 6: Final answer
    x = 298.30

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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.