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Finding the Fourth Proportional to 138.26, 207.38 and 46.94

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Solution

The fourth proportional to 138.26, 207.38 and 46.94 is: 70.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.26 : 207.38 = 46.94 : x
  2. Step 2: Convert to fraction form
    138.26/207.38 = 46.94/x
  3. Step 3: Cross multiply
    138.26x = 207.38 × 46.94
  4. Step 4: Simplify right side
    138.26x = 9,733.50
  5. Step 5: Solve for x
    x = 9,733.50/138.26
  6. Step 6: Final answer
    x = 70.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.