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Finding the Fourth Proportional to 70.45, 105.69 and 36.20

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Solution

The fourth proportional to 70.45, 105.69 and 36.20 is: 54.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.45 : 105.69 = 36.20 : x
  2. Step 2: Convert to fraction form
    70.45/105.69 = 36.20/x
  3. Step 3: Cross multiply
    70.45x = 105.69 × 36.20
  4. Step 4: Simplify right side
    70.45x = 3,825.58
  5. Step 5: Solve for x
    x = 3,825.58/70.45
  6. Step 6: Final answer
    x = 54.30

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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.