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Finding the Fourth Proportional to 92.92, 128.28 and 69.64

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Solution

The fourth proportional to 92.92, 128.28 and 69.64 is: 96.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.92 : 128.28 = 69.64 : x
  2. Step 2: Convert to fraction form
    92.92/128.28 = 69.64/x
  3. Step 3: Cross multiply
    92.92x = 128.28 × 69.64
  4. Step 4: Simplify right side
    92.92x = 8,933.42
  5. Step 5: Solve for x
    x = 8,933.42/92.92
  6. Step 6: Final answer
    x = 96.14

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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.