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Finding the Fourth Proportional to 91.58, 137.06 and 68.70

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Solution

The fourth proportional to 91.58, 137.06 and 68.70 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.58 : 137.06 = 68.70 : x
  2. Step 2: Convert to fraction form
    91.58/137.06 = 68.70/x
  3. Step 3: Cross multiply
    91.58x = 137.06 × 68.70
  4. Step 4: Simplify right side
    91.58x = 9,415.68
  5. Step 5: Solve for x
    x = 9,415.68/91.58
  6. Step 6: Final answer
    x = 102.81

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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.