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Finding the Fourth Proportional to 227.24, 313.59 and 128.99

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Solution

The fourth proportional to 227.24, 313.59 and 128.99 is: 178.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    227.24 : 313.59 = 128.99 : x
  2. Step 2: Convert to fraction form
    227.24/313.59 = 128.99/x
  3. Step 3: Cross multiply
    227.24x = 313.59 × 128.99
  4. Step 4: Simplify right side
    227.24x = 40,449.33
  5. Step 5: Solve for x
    x = 40,449.33/227.24
  6. Step 6: Final answer
    x = 178.01

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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.