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Finding the Fourth Proportional to 1,395.78, 2,081.48 and 1,223.24

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Solution

The fourth proportional to 1,395.78, 2,081.48 and 1,223.24 is: 1,824.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.78 : 2,081.48 = 1,223.24 : x
  2. Step 2: Convert to fraction form
    1,395.78/2,081.48 = 1,223.24/x
  3. Step 3: Cross multiply
    1,395.78x = 2,081.48 × 1,223.24
  4. Step 4: Simplify right side
    1,395.78x = 2,546,149.60
  5. Step 5: Solve for x
    x = 2,546,149.60/1,395.78
  6. Step 6: Final answer
    x = 1,824.18

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.