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Finding the Fourth Proportional to 307.69, 423.28 and 270.18

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Solution

The fourth proportional to 307.69, 423.28 and 270.18 is: 371.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.69 : 423.28 = 270.18 : x
  2. Step 2: Convert to fraction form
    307.69/423.28 = 270.18/x
  3. Step 3: Cross multiply
    307.69x = 423.28 × 270.18
  4. Step 4: Simplify right side
    307.69x = 114,361.79
  5. Step 5: Solve for x
    x = 114,361.79/307.69
  6. Step 6: Final answer
    x = 371.68

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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.