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Finding the Fourth Proportional to 104.71, 158.21 and 103.72

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Solution

The fourth proportional to 104.71, 158.21 and 103.72 is: 156.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.71 : 158.21 = 103.72 : x
  2. Step 2: Convert to fraction form
    104.71/158.21 = 103.72/x
  3. Step 3: Cross multiply
    104.71x = 158.21 × 103.72
  4. Step 4: Simplify right side
    104.71x = 16,409.54
  5. Step 5: Solve for x
    x = 16,409.54/104.71
  6. Step 6: Final answer
    x = 156.71

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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.