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Finding the Fourth Proportional to 105, 158.45 and 104.38

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Solution

The fourth proportional to 105, 158.45 and 104.38 is: 157.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    105 : 158.45 = 104.38 : x
  2. Step 2: Convert to fraction form
    105/158.45 = 104.38/x
  3. Step 3: Cross multiply
    105x = 158.45 × 104.38
  4. Step 4: Simplify right side
    105x = 16,539.01
  5. Step 5: Solve for x
    x = 16,539.01/105
  6. Step 6: Final answer
    x = 157.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.