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Finding the Fourth Proportional to 229.55, 316.74 and 131.28

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Solution

The fourth proportional to 229.55, 316.74 and 131.28 is: 181.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.55 : 316.74 = 131.28 : x
  2. Step 2: Convert to fraction form
    229.55/316.74 = 131.28/x
  3. Step 3: Cross multiply
    229.55x = 316.74 × 131.28
  4. Step 4: Simplify right side
    229.55x = 41,581.63
  5. Step 5: Solve for x
    x = 41,581.63/229.55
  6. Step 6: Final answer
    x = 181.15

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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.