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Finding the Fourth Proportional to 138.73, 207.79 and 70.03

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Solution

The fourth proportional to 138.73, 207.79 and 70.03 is: 104.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.73 : 207.79 = 70.03 : x
  2. Step 2: Convert to fraction form
    138.73/207.79 = 70.03/x
  3. Step 3: Cross multiply
    138.73x = 207.79 × 70.03
  4. Step 4: Simplify right side
    138.73x = 14,551.53
  5. Step 5: Solve for x
    x = 14,551.53/138.73
  6. Step 6: Final answer
    x = 104.89

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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.