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Finding the Fourth Proportional to 70.83, 105.99 and 40.28

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Solution

The fourth proportional to 70.83, 105.99 and 40.28 is: 60.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.83 : 105.99 = 40.28 : x
  2. Step 2: Convert to fraction form
    70.83/105.99 = 40.28/x
  3. Step 3: Cross multiply
    70.83x = 105.99 × 40.28
  4. Step 4: Simplify right side
    70.83x = 4,268.75
  5. Step 5: Solve for x
    x = 4,268.75/70.83
  6. Step 6: Final answer
    x = 60.27

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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.