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Finding the Fourth Proportional to 307.92, 425.12 and 191.64

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Solution

The fourth proportional to 307.92, 425.12 and 191.64 is: 264.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.92 : 425.12 = 191.64 : x
  2. Step 2: Convert to fraction form
    307.92/425.12 = 191.64/x
  3. Step 3: Cross multiply
    307.92x = 425.12 × 191.64
  4. Step 4: Simplify right side
    307.92x = 81,469.04
  5. Step 5: Solve for x
    x = 81,469.04/307.92
  6. Step 6: Final answer
    x = 264.58

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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.