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Finding the Fourth Proportional to 229.71, 316.76 and 155.90

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Solution

The fourth proportional to 229.71, 316.76 and 155.90 is: 214.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.71 : 316.76 = 155.90 : x
  2. Step 2: Convert to fraction form
    229.71/316.76 = 155.90/x
  3. Step 3: Cross multiply
    229.71x = 316.76 × 155.90
  4. Step 4: Simplify right side
    229.71x = 49,382.88
  5. Step 5: Solve for x
    x = 49,382.88/229.71
  6. Step 6: Final answer
    x = 214.98

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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.