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Finding the Fourth Proportional to 117.50, 161.88 and 113.54

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Solution

The fourth proportional to 117.50, 161.88 and 113.54 is: 156.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    117.50 : 161.88 = 113.54 : x
  2. Step 2: Convert to fraction form
    117.50/161.88 = 113.54/x
  3. Step 3: Cross multiply
    117.50x = 161.88 × 113.54
  4. Step 4: Simplify right side
    117.50x = 18,379.86
  5. Step 5: Solve for x
    x = 18,379.86/117.50
  6. Step 6: Final answer
    x = 156.42

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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.