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Finding the Fourth Proportional to 212.19, 318.89 and 104.05

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Solution

The fourth proportional to 212.19, 318.89 and 104.05 is: 156.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.19 : 318.89 = 104.05 : x
  2. Step 2: Convert to fraction form
    212.19/318.89 = 104.05/x
  3. Step 3: Cross multiply
    212.19x = 318.89 × 104.05
  4. Step 4: Simplify right side
    212.19x = 33,180.58
  5. Step 5: Solve for x
    x = 33,180.58/212.19
  6. Step 6: Final answer
    x = 156.37

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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.