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Finding the Fourth Proportional to 212.44, 318.72 and 109.72

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Solution

The fourth proportional to 212.44, 318.72 and 109.72 is: 164.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.44 : 318.72 = 109.72 : x
  2. Step 2: Convert to fraction form
    212.44/318.72 = 109.72/x
  3. Step 3: Cross multiply
    212.44x = 318.72 × 109.72
  4. Step 4: Simplify right side
    212.44x = 34,969.96
  5. Step 5: Solve for x
    x = 34,969.96/212.44
  6. Step 6: Final answer
    x = 164.61

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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.