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Finding the Fourth Proportional to 128.93, 176.77 and 126.62

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Solution

The fourth proportional to 128.93, 176.77 and 126.62 is: 173.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.93 : 176.77 = 126.62 : x
  2. Step 2: Convert to fraction form
    128.93/176.77 = 126.62/x
  3. Step 3: Cross multiply
    128.93x = 176.77 × 126.62
  4. Step 4: Simplify right side
    128.93x = 22,382.62
  5. Step 5: Solve for x
    x = 22,382.62/128.93
  6. Step 6: Final answer
    x = 173.60

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.