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Finding the Fourth Proportional to 137.88, 206.88 and 65.72

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Solution

The fourth proportional to 137.88, 206.88 and 65.72 is: 98.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.88 : 206.88 = 65.72 : x
  2. Step 2: Convert to fraction form
    137.88/206.88 = 65.72/x
  3. Step 3: Cross multiply
    137.88x = 206.88 × 65.72
  4. Step 4: Simplify right side
    137.88x = 13,596.15
  5. Step 5: Solve for x
    x = 13,596.15/137.88
  6. Step 6: Final answer
    x = 98.61

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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.