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Finding the Fourth Proportional to 1,790.72, 2,686 and 492.23

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Solution

The fourth proportional to 1,790.72, 2,686 and 492.23 is: 738.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,790.72 : 2,686 = 492.23 : x
  2. Step 2: Convert to fraction form
    1,790.72/2,686 = 492.23/x
  3. Step 3: Cross multiply
    1,790.72x = 2,686 × 492.23
  4. Step 4: Simplify right side
    1,790.72x = 1,322,129.78
  5. Step 5: Solve for x
    x = 1,322,129.78/1,790.72
  6. Step 6: Final answer
    x = 738.32

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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.