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Finding the Fourth Proportional to 247.12, 370.82 and 138.94

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Solution

The fourth proportional to 247.12, 370.82 and 138.94 is: 208.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.12 : 370.82 = 138.94 : x
  2. Step 2: Convert to fraction form
    247.12/370.82 = 138.94/x
  3. Step 3: Cross multiply
    247.12x = 370.82 × 138.94
  4. Step 4: Simplify right side
    247.12x = 51,521.04
  5. Step 5: Solve for x
    x = 51,521.04/247.12
  6. Step 6: Final answer
    x = 208.49

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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.