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Finding the Fourth Proportional to 211.64, 316.86 and 156.56

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Solution

The fourth proportional to 211.64, 316.86 and 156.56 is: 234.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    211.64 : 316.86 = 156.56 : x
  2. Step 2: Convert to fraction form
    211.64/316.86 = 156.56/x
  3. Step 3: Cross multiply
    211.64x = 316.86 × 156.56
  4. Step 4: Simplify right side
    211.64x = 49,607.81
  5. Step 5: Solve for x
    x = 49,607.81/211.64
  6. Step 6: Final answer
    x = 234.39

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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.