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Finding the Fourth Proportional to 212.81, 293.52 and 139.19

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Solution

The fourth proportional to 212.81, 293.52 and 139.19 is: 191.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.81 : 293.52 = 139.19 : x
  2. Step 2: Convert to fraction form
    212.81/293.52 = 139.19/x
  3. Step 3: Cross multiply
    212.81x = 293.52 × 139.19
  4. Step 4: Simplify right side
    212.81x = 40,855.05
  5. Step 5: Solve for x
    x = 40,855.05/212.81
  6. Step 6: Final answer
    x = 191.98

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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.