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Finding the Fourth Proportional to 137.91, 206.88 and 65.70

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Solution

The fourth proportional to 137.91, 206.88 and 65.70 is: 98.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.91 : 206.88 = 65.70 : x
  2. Step 2: Convert to fraction form
    137.91/206.88 = 65.70/x
  3. Step 3: Cross multiply
    137.91x = 206.88 × 65.70
  4. Step 4: Simplify right side
    137.91x = 13,592.02
  5. Step 5: Solve for x
    x = 13,592.02/137.91
  6. Step 6: Final answer
    x = 98.56

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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.