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Finding the Fourth Proportional to 105.99, 157.89 and 105.18

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Solution

The fourth proportional to 105.99, 157.89 and 105.18 is: 156.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.99 : 157.89 = 105.18 : x
  2. Step 2: Convert to fraction form
    105.99/157.89 = 105.18/x
  3. Step 3: Cross multiply
    105.99x = 157.89 × 105.18
  4. Step 4: Simplify right side
    105.99x = 16,606.87
  5. Step 5: Solve for x
    x = 16,606.87/105.99
  6. Step 6: Final answer
    x = 156.68

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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.