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Finding the Fourth Proportional to 232.78, 321.06 and 139.54

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Solution

The fourth proportional to 232.78, 321.06 and 139.54 is: 192.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    232.78 : 321.06 = 139.54 : x
  2. Step 2: Convert to fraction form
    232.78/321.06 = 139.54/x
  3. Step 3: Cross multiply
    232.78x = 321.06 × 139.54
  4. Step 4: Simplify right side
    232.78x = 44,800.71
  5. Step 5: Solve for x
    x = 44,800.71/232.78
  6. Step 6: Final answer
    x = 192.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.