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Finding the Fourth Proportional to 212.56, 316.25 and 211.84

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Solution

The fourth proportional to 212.56, 316.25 and 211.84 is: 315.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.56 : 316.25 = 211.84 : x
  2. Step 2: Convert to fraction form
    212.56/316.25 = 211.84/x
  3. Step 3: Cross multiply
    212.56x = 316.25 × 211.84
  4. Step 4: Simplify right side
    212.56x = 66,993.34
  5. Step 5: Solve for x
    x = 66,993.34/212.56
  6. Step 6: Final answer
    x = 315.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.