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Finding the Fourth Proportional to 92.50, 128.16 and 91.39

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Solution

The fourth proportional to 92.50, 128.16 and 91.39 is: 126.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.50 : 128.16 = 91.39 : x
  2. Step 2: Convert to fraction form
    92.50/128.16 = 91.39/x
  3. Step 3: Cross multiply
    92.50x = 128.16 × 91.39
  4. Step 4: Simplify right side
    92.50x = 11,711.44
  5. Step 5: Solve for x
    x = 11,711.44/92.50
  6. Step 6: Final answer
    x = 126.62

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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.