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Finding the Fourth Proportional to 121.99, 182.91 and 70.57

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Solution

The fourth proportional to 121.99, 182.91 and 70.57 is: 105.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.99 : 182.91 = 70.57 : x
  2. Step 2: Convert to fraction form
    121.99/182.91 = 70.57/x
  3. Step 3: Cross multiply
    121.99x = 182.91 × 70.57
  4. Step 4: Simplify right side
    121.99x = 12,907.96
  5. Step 5: Solve for x
    x = 12,907.96/121.99
  6. Step 6: Final answer
    x = 105.81

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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.