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Finding the Fourth Proportional to 307.69, 424.49 and 191.19

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Solution

The fourth proportional to 307.69, 424.49 and 191.19 is: 263.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.69 : 424.49 = 191.19 : x
  2. Step 2: Convert to fraction form
    307.69/424.49 = 191.19/x
  3. Step 3: Cross multiply
    307.69x = 424.49 × 191.19
  4. Step 4: Simplify right side
    307.69x = 81,156.70
  5. Step 5: Solve for x
    x = 81,156.70/307.69
  6. Step 6: Final answer
    x = 263.76

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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.