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Finding the Fourth Proportional to 247.65, 371.54 and 139.52

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Solution

The fourth proportional to 247.65, 371.54 and 139.52 is: 209.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.65 : 371.54 = 139.52 : x
  2. Step 2: Convert to fraction form
    247.65/371.54 = 139.52/x
  3. Step 3: Cross multiply
    247.65x = 371.54 × 139.52
  4. Step 4: Simplify right side
    247.65x = 51,837.26
  5. Step 5: Solve for x
    x = 51,837.26/247.65
  6. Step 6: Final answer
    x = 209.32

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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.