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Finding the Fourth Proportional to 229.66, 316.89 and 131.40

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Solution

The fourth proportional to 229.66, 316.89 and 131.40 is: 181.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.66 : 316.89 = 131.40 : x
  2. Step 2: Convert to fraction form
    229.66/316.89 = 131.40/x
  3. Step 3: Cross multiply
    229.66x = 316.89 × 131.40
  4. Step 4: Simplify right side
    229.66x = 41,639.35
  5. Step 5: Solve for x
    x = 41,639.35/229.66
  6. Step 6: Final answer
    x = 181.31

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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.