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Finding the Fourth Proportional to 128.05, 176.62 and 92.55

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Solution

The fourth proportional to 128.05, 176.62 and 92.55 is: 127.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.05 : 176.62 = 92.55 : x
  2. Step 2: Convert to fraction form
    128.05/176.62 = 92.55/x
  3. Step 3: Cross multiply
    128.05x = 176.62 × 92.55
  4. Step 4: Simplify right side
    128.05x = 16,346.18
  5. Step 5: Solve for x
    x = 16,346.18/128.05
  6. Step 6: Final answer
    x = 127.65

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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.