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Finding the Fourth Proportional to 140.12, 208.70 and 137.12

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Solution

The fourth proportional to 140.12, 208.70 and 137.12 is: 204.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.12 : 208.70 = 137.12 : x
  2. Step 2: Convert to fraction form
    140.12/208.70 = 137.12/x
  3. Step 3: Cross multiply
    140.12x = 208.70 × 137.12
  4. Step 4: Simplify right side
    140.12x = 28,615.21
  5. Step 5: Solve for x
    x = 28,615.21/140.12
  6. Step 6: Final answer
    x = 204.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.