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Finding the Fourth Proportional to 293.11, 439.40 and 138.94

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Solution

The fourth proportional to 293.11, 439.40 and 138.94 is: 208.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.11 : 439.40 = 138.94 : x
  2. Step 2: Convert to fraction form
    293.11/439.40 = 138.94/x
  3. Step 3: Cross multiply
    293.11x = 439.40 × 138.94
  4. Step 4: Simplify right side
    293.11x = 61,047.34
  5. Step 5: Solve for x
    x = 61,047.34/293.11
  6. Step 6: Final answer
    x = 208.28

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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.