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Finding the Fourth Proportional to 313.28, 431.44 and 266.56

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Solution

The fourth proportional to 313.28, 431.44 and 266.56 is: 367.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.28 : 431.44 = 266.56 : x
  2. Step 2: Convert to fraction form
    313.28/431.44 = 266.56/x
  3. Step 3: Cross multiply
    313.28x = 431.44 × 266.56
  4. Step 4: Simplify right side
    313.28x = 115,004.65
  5. Step 5: Solve for x
    x = 115,004.65/313.28
  6. Step 6: Final answer
    x = 367.10

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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.