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Finding the Fourth Proportional to 140.40, 193.44 and 105.36

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Solution

The fourth proportional to 140.40, 193.44 and 105.36 is: 145.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.40 : 193.44 = 105.36 : x
  2. Step 2: Convert to fraction form
    140.40/193.44 = 105.36/x
  3. Step 3: Cross multiply
    140.40x = 193.44 × 105.36
  4. Step 4: Simplify right side
    140.40x = 20,380.84
  5. Step 5: Solve for x
    x = 20,380.84/140.40
  6. Step 6: Final answer
    x = 145.16

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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.