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Finding the Fourth Proportional to 138.36, 207.57 and 47.07

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Solution

The fourth proportional to 138.36, 207.57 and 47.07 is: 70.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.36 : 207.57 = 47.07 : x
  2. Step 2: Convert to fraction form
    138.36/207.57 = 47.07/x
  3. Step 3: Cross multiply
    138.36x = 207.57 × 47.07
  4. Step 4: Simplify right side
    138.36x = 9,770.32
  5. Step 5: Solve for x
    x = 9,770.32/138.36
  6. Step 6: Final answer
    x = 70.62

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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.