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Finding the Fourth Proportional to 212.72, 293.45 and 139.04

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Solution

The fourth proportional to 212.72, 293.45 and 139.04 is: 191.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.72 : 293.45 = 139.04 : x
  2. Step 2: Convert to fraction form
    212.72/293.45 = 139.04/x
  3. Step 3: Cross multiply
    212.72x = 293.45 × 139.04
  4. Step 4: Simplify right side
    212.72x = 40,801.29
  5. Step 5: Solve for x
    x = 40,801.29/212.72
  6. Step 6: Final answer
    x = 191.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.