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Finding the Fourth Proportional to 229.65, 316.97 and 156.21

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Solution

The fourth proportional to 229.65, 316.97 and 156.21 is: 215.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.65 : 316.97 = 156.21 : x
  2. Step 2: Convert to fraction form
    229.65/316.97 = 156.21/x
  3. Step 3: Cross multiply
    229.65x = 316.97 × 156.21
  4. Step 4: Simplify right side
    229.65x = 49,513.10
  5. Step 5: Solve for x
    x = 49,513.10/229.65
  6. Step 6: Final answer
    x = 215.60

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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.