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Finding the Fourth Proportional to 212.64, 316.48 and 211.84

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Solution

The fourth proportional to 212.64, 316.48 and 211.84 is: 315.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.64 : 316.48 = 211.84 : x
  2. Step 2: Convert to fraction form
    212.64/316.48 = 211.84/x
  3. Step 3: Cross multiply
    212.64x = 316.48 × 211.84
  4. Step 4: Simplify right side
    212.64x = 67,043.12
  5. Step 5: Solve for x
    x = 67,043.12/212.64
  6. Step 6: Final answer
    x = 315.29

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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.