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Finding the Fourth Proportional to 211.20, 316.72 and 156.88

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Solution

The fourth proportional to 211.20, 316.72 and 156.88 is: 235.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.20 : 316.72 = 156.88 : x
  2. Step 2: Convert to fraction form
    211.20/316.72 = 156.88/x
  3. Step 3: Cross multiply
    211.20x = 316.72 × 156.88
  4. Step 4: Simplify right side
    211.20x = 49,687.03
  5. Step 5: Solve for x
    x = 49,687.03/211.20
  6. Step 6: Final answer
    x = 235.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.