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Finding the Fourth Proportional to 140.50, 193.98 and 105.60

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Solution

The fourth proportional to 140.50, 193.98 and 105.60 is: 145.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.50 : 193.98 = 105.60 : x
  2. Step 2: Convert to fraction form
    140.50/193.98 = 105.60/x
  3. Step 3: Cross multiply
    140.50x = 193.98 × 105.60
  4. Step 4: Simplify right side
    140.50x = 20,485.26
  5. Step 5: Solve for x
    x = 20,485.26/140.50
  6. Step 6: Final answer
    x = 145.81

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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.