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Finding the Fourth Proportional to 307.21, 423.86 and 189.20

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Solution

The fourth proportional to 307.21, 423.86 and 189.20 is: 261.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.21 : 423.86 = 189.20 : x
  2. Step 2: Convert to fraction form
    307.21/423.86 = 189.20/x
  3. Step 3: Cross multiply
    307.21x = 423.86 × 189.20
  4. Step 4: Simplify right side
    307.21x = 80,194.31
  5. Step 5: Solve for x
    x = 80,194.31/307.21
  6. Step 6: Final answer
    x = 261.04

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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.