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Finding the Fourth Proportional to 247.90, 371.65 and 139.66

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Solution

The fourth proportional to 247.90, 371.65 and 139.66 is: 209.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.90 : 371.65 = 139.66 : x
  2. Step 2: Convert to fraction form
    247.90/371.65 = 139.66/x
  3. Step 3: Cross multiply
    247.90x = 371.65 × 139.66
  4. Step 4: Simplify right side
    247.90x = 51,904.64
  5. Step 5: Solve for x
    x = 51,904.64/247.90
  6. Step 6: Final answer
    x = 209.38

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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.