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Finding the Fourth Proportional to 235.40, 324.96 and 156.85

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Solution

The fourth proportional to 235.40, 324.96 and 156.85 is: 216.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.40 : 324.96 = 156.85 : x
  2. Step 2: Convert to fraction form
    235.40/324.96 = 156.85/x
  3. Step 3: Cross multiply
    235.40x = 324.96 × 156.85
  4. Step 4: Simplify right side
    235.40x = 50,969.75
  5. Step 5: Solve for x
    x = 50,969.75/235.40
  6. Step 6: Final answer
    x = 216.53

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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.