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Finding the Fourth Proportional to 293.18, 439.38 and 138.90

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Solution

The fourth proportional to 293.18, 439.38 and 138.90 is: 208.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    293.18 : 439.38 = 138.90 : x
  2. Step 2: Convert to fraction form
    293.18/439.38 = 138.90/x
  3. Step 3: Cross multiply
    293.18x = 439.38 × 138.90
  4. Step 4: Simplify right side
    293.18x = 61,029.88
  5. Step 5: Solve for x
    x = 61,029.88/293.18
  6. Step 6: Final answer
    x = 208.17

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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.