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Finding the Fourth Proportional to 212.90, 293.83 and 139.32

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Solution

The fourth proportional to 212.90, 293.83 and 139.32 is: 192.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.90 : 293.83 = 139.32 : x
  2. Step 2: Convert to fraction form
    212.90/293.83 = 139.32/x
  3. Step 3: Cross multiply
    212.90x = 293.83 × 139.32
  4. Step 4: Simplify right side
    212.90x = 40,936.05
  5. Step 5: Solve for x
    x = 40,936.05/212.90
  6. Step 6: Final answer
    x = 192.28

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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.