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Finding the Fourth Proportional to 307.26, 423.88 and 189.18

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Solution

The fourth proportional to 307.26, 423.88 and 189.18 is: 260.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.26 : 423.88 = 189.18 : x
  2. Step 2: Convert to fraction form
    307.26/423.88 = 189.18/x
  3. Step 3: Cross multiply
    307.26x = 423.88 × 189.18
  4. Step 4: Simplify right side
    307.26x = 80,189.62
  5. Step 5: Solve for x
    x = 80,189.62/307.26
  6. Step 6: Final answer
    x = 260.98

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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.