Home / 1,040.22-1,561.20-492.78

Finding the Fourth Proportional to 1,040.22, 1,561.20 and 492.78

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Solution

The fourth proportional to 1,040.22, 1,561.20 and 492.78 is: 739.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.22 : 1,561.20 = 492.78 : x
  2. Step 2: Convert to fraction form
    1,040.22/1,561.20 = 492.78/x
  3. Step 3: Cross multiply
    1,040.22x = 1,561.20 × 492.78
  4. Step 4: Simplify right side
    1,040.22x = 769,328.14
  5. Step 5: Solve for x
    x = 769,328.14/1,040.22
  6. Step 6: Final answer
    x = 739.58

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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.