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Finding the Fourth Proportional to 229.78, 316.62 and 188.20

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Solution

The fourth proportional to 229.78, 316.62 and 188.20 is: 259.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.78 : 316.62 = 188.20 : x
  2. Step 2: Convert to fraction form
    229.78/316.62 = 188.20/x
  3. Step 3: Cross multiply
    229.78x = 316.62 × 188.20
  4. Step 4: Simplify right side
    229.78x = 59,587.88
  5. Step 5: Solve for x
    x = 59,587.88/229.78
  6. Step 6: Final answer
    x = 259.33

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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.