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Finding the Fourth Proportional to 140.21, 193.53 and 82.00

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Solution

The fourth proportional to 140.21, 193.53 and 82.00 is: 113.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.21 : 193.53 = 82.00 : x
  2. Step 2: Convert to fraction form
    140.21/193.53 = 82.00/x
  3. Step 3: Cross multiply
    140.21x = 193.53 × 82.00
  4. Step 4: Simplify right side
    140.21x = 15,870.01
  5. Step 5: Solve for x
    x = 15,870.01/140.21
  6. Step 6: Final answer
    x = 113.19

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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.