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Finding the Fourth Proportional to 105.47, 158.21 and 28.43

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Solution

The fourth proportional to 105.47, 158.21 and 28.43 is: 42.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.47 : 158.21 = 28.43 : x
  2. Step 2: Convert to fraction form
    105.47/158.21 = 28.43/x
  3. Step 3: Cross multiply
    105.47x = 158.21 × 28.43
  4. Step 4: Simplify right side
    105.47x = 4,498.11
  5. Step 5: Solve for x
    x = 4,498.11/105.47
  6. Step 6: Final answer
    x = 42.65

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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.