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Finding the Fourth Proportional to 308.98, 426.20 and 191.01

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Solution

The fourth proportional to 308.98, 426.20 and 191.01 is: 263.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.98 : 426.20 = 191.01 : x
  2. Step 2: Convert to fraction form
    308.98/426.20 = 191.01/x
  3. Step 3: Cross multiply
    308.98x = 426.20 × 191.01
  4. Step 4: Simplify right side
    308.98x = 81,408.46
  5. Step 5: Solve for x
    x = 81,408.46/308.98
  6. Step 6: Final answer
    x = 263.47

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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.