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Finding the Fourth Proportional to 105.43, 158.15 and 51.28

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Solution

The fourth proportional to 105.43, 158.15 and 51.28 is: 76.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.43 : 158.15 = 51.28 : x
  2. Step 2: Convert to fraction form
    105.43/158.15 = 51.28/x
  3. Step 3: Cross multiply
    105.43x = 158.15 × 51.28
  4. Step 4: Simplify right side
    105.43x = 8,110.33
  5. Step 5: Solve for x
    x = 8,110.33/105.43
  6. Step 6: Final answer
    x = 76.93

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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.