Home / 1,320.24-1,980.44-395.80

Finding the Fourth Proportional to 1,320.24, 1,980.44 and 395.80

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Solution

The fourth proportional to 1,320.24, 1,980.44 and 395.80 is: 593.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.24 : 1,980.44 = 395.80 : x
  2. Step 2: Convert to fraction form
    1,320.24/1,980.44 = 395.80/x
  3. Step 3: Cross multiply
    1,320.24x = 1,980.44 × 395.80
  4. Step 4: Simplify right side
    1,320.24x = 783,858.15
  5. Step 5: Solve for x
    x = 783,858.15/1,320.24
  6. Step 6: Final answer
    x = 593.72

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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.