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Finding the Fourth Proportional to 208.70, 312.89 and 105.87

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Solution

The fourth proportional to 208.70, 312.89 and 105.87 is: 158.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    208.70 : 312.89 = 105.87 : x
  2. Step 2: Convert to fraction form
    208.70/312.89 = 105.87/x
  3. Step 3: Cross multiply
    208.70x = 312.89 × 105.87
  4. Step 4: Simplify right side
    208.70x = 33,125.13
  5. Step 5: Solve for x
    x = 33,125.13/208.70
  6. Step 6: Final answer
    x = 158.73

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.