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Finding the Fourth Proportional to 233.12, 321.68 and 139.90

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Solution

The fourth proportional to 233.12, 321.68 and 139.90 is: 193.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    233.12 : 321.68 = 139.90 : x
  2. Step 2: Convert to fraction form
    233.12/321.68 = 139.90/x
  3. Step 3: Cross multiply
    233.12x = 321.68 × 139.90
  4. Step 4: Simplify right side
    233.12x = 45,004.28
  5. Step 5: Solve for x
    x = 45,004.28/233.12
  6. Step 6: Final answer
    x = 193.06

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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.