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Finding the Fourth Proportional to 92.95, 128.40 and 80.65

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Solution

The fourth proportional to 92.95, 128.40 and 80.65 is: 111.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.95 : 128.40 = 80.65 : x
  2. Step 2: Convert to fraction form
    92.95/128.40 = 80.65/x
  3. Step 3: Cross multiply
    92.95x = 128.40 × 80.65
  4. Step 4: Simplify right side
    92.95x = 10,354.96
  5. Step 5: Solve for x
    x = 10,354.96/92.95
  6. Step 6: Final answer
    x = 111.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.