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Finding the Fourth Proportional to 307.94, 423.81 and 220.46

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Solution

The fourth proportional to 307.94, 423.81 and 220.46 is: 303.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.94 : 423.81 = 220.46 : x
  2. Step 2: Convert to fraction form
    307.94/423.81 = 220.46/x
  3. Step 3: Cross multiply
    307.94x = 423.81 × 220.46
  4. Step 4: Simplify right side
    307.94x = 93,431.03
  5. Step 5: Solve for x
    x = 93,431.03/307.94
  6. Step 6: Final answer
    x = 303.41

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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.