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Finding the Fourth Proportional to 307.14, 423 and 251.70

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Solution

The fourth proportional to 307.14, 423 and 251.70 is: 346.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.14 : 423 = 251.70 : x
  2. Step 2: Convert to fraction form
    307.14/423 = 251.70/x
  3. Step 3: Cross multiply
    307.14x = 423 × 251.70
  4. Step 4: Simplify right side
    307.14x = 106,469.10
  5. Step 5: Solve for x
    x = 106,469.10/307.14
  6. Step 6: Final answer
    x = 346.65

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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.