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Finding the Fourth Proportional to 229.90, 317.32 and 136.71

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Solution

The fourth proportional to 229.90, 317.32 and 136.71 is: 188.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.90 : 317.32 = 136.71 : x
  2. Step 2: Convert to fraction form
    229.90/317.32 = 136.71/x
  3. Step 3: Cross multiply
    229.90x = 317.32 × 136.71
  4. Step 4: Simplify right side
    229.90x = 43,380.22
  5. Step 5: Solve for x
    x = 43,380.22/229.90
  6. Step 6: Final answer
    x = 188.69

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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.