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Finding the Fourth Proportional to 3,640.78, 5,024.31 and 1,984.78

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Solution

The fourth proportional to 3,640.78, 5,024.31 and 1,984.78 is: 2,739.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,640.78 : 5,024.31 = 1,984.78 : x
  2. Step 2: Convert to fraction form
    3,640.78/5,024.31 = 1,984.78/x
  3. Step 3: Cross multiply
    3,640.78x = 5,024.31 × 1,984.78
  4. Step 4: Simplify right side
    3,640.78x = 9,972,150.00
  5. Step 5: Solve for x
    x = 9,972,150.00/3,640.78
  6. Step 6: Final answer
    x = 2,739.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.