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Finding the Fourth Proportional to 307.11, 423.78 and 189.03

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Solution

The fourth proportional to 307.11, 423.78 and 189.03 is: 260.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.11 : 423.78 = 189.03 : x
  2. Step 2: Convert to fraction form
    307.11/423.78 = 189.03/x
  3. Step 3: Cross multiply
    307.11x = 423.78 × 189.03
  4. Step 4: Simplify right side
    307.11x = 80,107.13
  5. Step 5: Solve for x
    x = 80,107.13/307.11
  6. Step 6: Final answer
    x = 260.84

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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.