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Finding the Fourth Proportional to 235.18, 352.79 and 139.58

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Solution

The fourth proportional to 235.18, 352.79 and 139.58 is: 209.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.18 : 352.79 = 139.58 : x
  2. Step 2: Convert to fraction form
    235.18/352.79 = 139.58/x
  3. Step 3: Cross multiply
    235.18x = 352.79 × 139.58
  4. Step 4: Simplify right side
    235.18x = 49,242.43
  5. Step 5: Solve for x
    x = 49,242.43/235.18
  6. Step 6: Final answer
    x = 209.38

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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.