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Finding the Fourth Proportional to 212.20, 318.40 and 104.06

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Solution

The fourth proportional to 212.20, 318.40 and 104.06 is: 156.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.20 : 318.40 = 104.06 : x
  2. Step 2: Convert to fraction form
    212.20/318.40 = 104.06/x
  3. Step 3: Cross multiply
    212.20x = 318.40 × 104.06
  4. Step 4: Simplify right side
    212.20x = 33,133.24
  5. Step 5: Solve for x
    x = 33,133.24/212.20
  6. Step 6: Final answer
    x = 156.14

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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.