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Finding the Fourth Proportional to 225.21, 310.76 and 142.18

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Solution

The fourth proportional to 225.21, 310.76 and 142.18 is: 196.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.21 : 310.76 = 142.18 : x
  2. Step 2: Convert to fraction form
    225.21/310.76 = 142.18/x
  3. Step 3: Cross multiply
    225.21x = 310.76 × 142.18
  4. Step 4: Simplify right side
    225.21x = 44,182.37
  5. Step 5: Solve for x
    x = 44,182.37/225.21
  6. Step 6: Final answer
    x = 196.18

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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.