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Finding the Fourth Proportional to 197.07, 294.57 and 138.90

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Solution

The fourth proportional to 197.07, 294.57 and 138.90 is: 207.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    197.07 : 294.57 = 138.90 : x
  2. Step 2: Convert to fraction form
    197.07/294.57 = 138.90/x
  3. Step 3: Cross multiply
    197.07x = 294.57 × 138.90
  4. Step 4: Simplify right side
    197.07x = 40,915.22
  5. Step 5: Solve for x
    x = 40,915.22/197.07
  6. Step 6: Final answer
    x = 207.62

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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.