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Finding the Fourth Proportional to 237.21, 355.31 and 139.61

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Solution

The fourth proportional to 237.21, 355.31 and 139.61 is: 209.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    237.21 : 355.31 = 139.61 : x
  2. Step 2: Convert to fraction form
    237.21/355.31 = 139.61/x
  3. Step 3: Cross multiply
    237.21x = 355.31 × 139.61
  4. Step 4: Simplify right side
    237.21x = 49,602.35
  5. Step 5: Solve for x
    x = 49,602.35/237.21
  6. Step 6: Final answer
    x = 209.11

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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.