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Finding the Fourth Proportional to 181.12, 271.20 and 139.81

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Solution

The fourth proportional to 181.12, 271.20 and 139.81 is: 209.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.12 : 271.20 = 139.81 : x
  2. Step 2: Convert to fraction form
    181.12/271.20 = 139.81/x
  3. Step 3: Cross multiply
    181.12x = 271.20 × 139.81
  4. Step 4: Simplify right side
    181.12x = 37,916.47
  5. Step 5: Solve for x
    x = 37,916.47/181.12
  6. Step 6: Final answer
    x = 209.34

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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.