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Finding the Fourth Proportional to 307.12, 423.24 and 274.48

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Solution

The fourth proportional to 307.12, 423.24 and 274.48 is: 378.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.12 : 423.24 = 274.48 : x
  2. Step 2: Convert to fraction form
    307.12/423.24 = 274.48/x
  3. Step 3: Cross multiply
    307.12x = 423.24 × 274.48
  4. Step 4: Simplify right side
    307.12x = 116,170.92
  5. Step 5: Solve for x
    x = 116,170.92/307.12
  6. Step 6: Final answer
    x = 378.26

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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.