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Finding the Fourth Proportional to 229.12, 316.31 and 155.57

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Solution

The fourth proportional to 229.12, 316.31 and 155.57 is: 214.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.12 : 316.31 = 155.57 : x
  2. Step 2: Convert to fraction form
    229.12/316.31 = 155.57/x
  3. Step 3: Cross multiply
    229.12x = 316.31 × 155.57
  4. Step 4: Simplify right side
    229.12x = 49,205.99
  5. Step 5: Solve for x
    x = 49,205.99/229.12
  6. Step 6: Final answer
    x = 214.76

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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.