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Finding the Fourth Proportional to 137.99, 206.87 and 69.48

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Solution

The fourth proportional to 137.99, 206.87 and 69.48 is: 104.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.99 : 206.87 = 69.48 : x
  2. Step 2: Convert to fraction form
    137.99/206.87 = 69.48/x
  3. Step 3: Cross multiply
    137.99x = 206.87 × 69.48
  4. Step 4: Simplify right side
    137.99x = 14,372.98
  5. Step 5: Solve for x
    x = 14,372.98/137.99
  6. Step 6: Final answer
    x = 104.16

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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.