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Finding the Fourth Proportional to 137.98, 206.80 and 65.69

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Solution

The fourth proportional to 137.98, 206.80 and 65.69 is: 98.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.98 : 206.80 = 65.69 : x
  2. Step 2: Convert to fraction form
    137.98/206.80 = 65.69/x
  3. Step 3: Cross multiply
    137.98x = 206.80 × 65.69
  4. Step 4: Simplify right side
    137.98x = 13,584.69
  5. Step 5: Solve for x
    x = 13,584.69/137.98
  6. Step 6: Final answer
    x = 98.45

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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.