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Finding the Fourth Proportional to 208.56, 310.93 and 191.28

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Solution

The fourth proportional to 208.56, 310.93 and 191.28 is: 285.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.56 : 310.93 = 191.28 : x
  2. Step 2: Convert to fraction form
    208.56/310.93 = 191.28/x
  3. Step 3: Cross multiply
    208.56x = 310.93 × 191.28
  4. Step 4: Simplify right side
    208.56x = 59,474.69
  5. Step 5: Solve for x
    x = 59,474.69/208.56
  6. Step 6: Final answer
    x = 285.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.