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Finding the Fourth Proportional to 225.21, 310.98 and 142.46

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Solution

The fourth proportional to 225.21, 310.98 and 142.46 is: 196.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.21 : 310.98 = 142.46 : x
  2. Step 2: Convert to fraction form
    225.21/310.98 = 142.46/x
  3. Step 3: Cross multiply
    225.21x = 310.98 × 142.46
  4. Step 4: Simplify right side
    225.21x = 44,302.21
  5. Step 5: Solve for x
    x = 44,302.21/225.21
  6. Step 6: Final answer
    x = 196.72

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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.