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Finding the Fourth Proportional to 227.09, 313.40 and 128.87

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Solution

The fourth proportional to 227.09, 313.40 and 128.87 is: 177.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.09 : 313.40 = 128.87 : x
  2. Step 2: Convert to fraction form
    227.09/313.40 = 128.87/x
  3. Step 3: Cross multiply
    227.09x = 313.40 × 128.87
  4. Step 4: Simplify right side
    227.09x = 40,387.86
  5. Step 5: Solve for x
    x = 40,387.86/227.09
  6. Step 6: Final answer
    x = 177.85

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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.