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Finding the Fourth Proportional to 229.40, 316.30 and 155.88

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Solution

The fourth proportional to 229.40, 316.30 and 155.88 is: 214.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    229.40 : 316.30 = 155.88 : x
  2. Step 2: Convert to fraction form
    229.40/316.30 = 155.88/x
  3. Step 3: Cross multiply
    229.40x = 316.30 × 155.88
  4. Step 4: Simplify right side
    229.40x = 49,304.84
  5. Step 5: Solve for x
    x = 49,304.84/229.40
  6. Step 6: Final answer
    x = 214.93

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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.