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Finding the Fourth Proportional to 336.90, 505.40 and 105.81

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Solution

The fourth proportional to 336.90, 505.40 and 105.81 is: 158.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    336.90 : 505.40 = 105.81 : x
  2. Step 2: Convert to fraction form
    336.90/505.40 = 105.81/x
  3. Step 3: Cross multiply
    336.90x = 505.40 × 105.81
  4. Step 4: Simplify right side
    336.90x = 53,476.37
  5. Step 5: Solve for x
    x = 53,476.37/336.90
  6. Step 6: Final answer
    x = 158.73

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Why These Related Problems?

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