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Finding the Fourth Proportional to 92.48, 128.50 and 91.32

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Solution

The fourth proportional to 92.48, 128.50 and 91.32 is: 126.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.48 : 128.50 = 91.32 : x
  2. Step 2: Convert to fraction form
    92.48/128.50 = 91.32/x
  3. Step 3: Cross multiply
    92.48x = 128.50 × 91.32
  4. Step 4: Simplify right side
    92.48x = 11,734.62
  5. Step 5: Solve for x
    x = 11,734.62/92.48
  6. Step 6: Final answer
    x = 126.89

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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.