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Finding the Fourth Proportional to 229.45, 316.65 and 131.21

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Solution

The fourth proportional to 229.45, 316.65 and 131.21 is: 181.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.45 : 316.65 = 131.21 : x
  2. Step 2: Convert to fraction form
    229.45/316.65 = 131.21/x
  3. Step 3: Cross multiply
    229.45x = 316.65 × 131.21
  4. Step 4: Simplify right side
    229.45x = 41,547.65
  5. Step 5: Solve for x
    x = 41,547.65/229.45
  6. Step 6: Final answer
    x = 181.07

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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.