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Finding the Fourth Proportional to 92.60, 128.38 and 90.44

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Solution

The fourth proportional to 92.60, 128.38 and 90.44 is: 125.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.60 : 128.38 = 90.44 : x
  2. Step 2: Convert to fraction form
    92.60/128.38 = 90.44/x
  3. Step 3: Cross multiply
    92.60x = 128.38 × 90.44
  4. Step 4: Simplify right side
    92.60x = 11,610.69
  5. Step 5: Solve for x
    x = 11,610.69/92.60
  6. Step 6: Final answer
    x = 125.39

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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.