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Finding the Fourth Proportional to 92.93, 128.34 and 85.14

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Solution

The fourth proportional to 92.93, 128.34 and 85.14 is: 117.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.93 : 128.34 = 85.14 : x
  2. Step 2: Convert to fraction form
    92.93/128.34 = 85.14/x
  3. Step 3: Cross multiply
    92.93x = 128.34 × 85.14
  4. Step 4: Simplify right side
    92.93x = 10,926.87
  5. Step 5: Solve for x
    x = 10,926.87/92.93
  6. Step 6: Final answer
    x = 117.59

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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.