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Finding the Fourth Proportional to 293.21, 439.81 and 139.11

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Solution

The fourth proportional to 293.21, 439.81 and 139.11 is: 208.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.21 : 439.81 = 139.11 : x
  2. Step 2: Convert to fraction form
    293.21/439.81 = 139.11/x
  3. Step 3: Cross multiply
    293.21x = 439.81 × 139.11
  4. Step 4: Simplify right side
    293.21x = 61,181.97
  5. Step 5: Solve for x
    x = 61,181.97/293.21
  6. Step 6: Final answer
    x = 208.66

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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.