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Finding the Fourth Proportional to 307.85, 424.76 and 191.43

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Solution

The fourth proportional to 307.85, 424.76 and 191.43 is: 264.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.85 : 424.76 = 191.43 : x
  2. Step 2: Convert to fraction form
    307.85/424.76 = 191.43/x
  3. Step 3: Cross multiply
    307.85x = 424.76 × 191.43
  4. Step 4: Simplify right side
    307.85x = 81,310.85
  5. Step 5: Solve for x
    x = 81,310.85/307.85
  6. Step 6: Final answer
    x = 264.13

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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.