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Finding the Fourth Proportional to 229.55, 316.86 and 142.25

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Solution

The fourth proportional to 229.55, 316.86 and 142.25 is: 196.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.55 : 316.86 = 142.25 : x
  2. Step 2: Convert to fraction form
    229.55/316.86 = 142.25/x
  3. Step 3: Cross multiply
    229.55x = 316.86 × 142.25
  4. Step 4: Simplify right side
    229.55x = 45,073.34
  5. Step 5: Solve for x
    x = 45,073.34/229.55
  6. Step 6: Final answer
    x = 196.36

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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.