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Finding the Fourth Proportional to 92.60, 128.68 and 91.66

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Solution

The fourth proportional to 92.60, 128.68 and 91.66 is: 127.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.60 : 128.68 = 91.66 : x
  2. Step 2: Convert to fraction form
    92.60/128.68 = 91.66/x
  3. Step 3: Cross multiply
    92.60x = 128.68 × 91.66
  4. Step 4: Simplify right side
    92.60x = 11,794.35
  5. Step 5: Solve for x
    x = 11,794.35/92.60
  6. Step 6: Final answer
    x = 127.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.