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Finding the Fourth Proportional to 307.20, 423.72 and 227.28

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Solution

The fourth proportional to 307.20, 423.72 and 227.28 is: 313.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.20 : 423.72 = 227.28 : x
  2. Step 2: Convert to fraction form
    307.20/423.72 = 227.28/x
  3. Step 3: Cross multiply
    307.20x = 423.72 × 227.28
  4. Step 4: Simplify right side
    307.20x = 96,303.08
  5. Step 5: Solve for x
    x = 96,303.08/307.20
  6. Step 6: Final answer
    x = 313.49

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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.