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Finding the Fourth Proportional to 235.50, 324.88 and 137.20

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Solution

The fourth proportional to 235.50, 324.88 and 137.20 is: 189.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.50 : 324.88 = 137.20 : x
  2. Step 2: Convert to fraction form
    235.50/324.88 = 137.20/x
  3. Step 3: Cross multiply
    235.50x = 324.88 × 137.20
  4. Step 4: Simplify right side
    235.50x = 44,572.90
  5. Step 5: Solve for x
    x = 44,572.90/235.50
  6. Step 6: Final answer
    x = 189.27

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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.