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Finding the Fourth Proportional to 229.78, 317.12 and 131.54

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Solution

The fourth proportional to 229.78, 317.12 and 131.54 is: 181.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.78 : 317.12 = 131.54 : x
  2. Step 2: Convert to fraction form
    229.78/317.12 = 131.54/x
  3. Step 3: Cross multiply
    229.78x = 317.12 × 131.54
  4. Step 4: Simplify right side
    229.78x = 41,712.71
  5. Step 5: Solve for x
    x = 41,712.71/229.78
  6. Step 6: Final answer
    x = 181.54

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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.