Home / 1,418.25-2,128.19-648.75

Finding the Fourth Proportional to 1,418.25, 2,128.19 and 648.75

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Solution

The fourth proportional to 1,418.25, 2,128.19 and 648.75 is: 973.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.25 : 2,128.19 = 648.75 : x
  2. Step 2: Convert to fraction form
    1,418.25/2,128.19 = 648.75/x
  3. Step 3: Cross multiply
    1,418.25x = 2,128.19 × 648.75
  4. Step 4: Simplify right side
    1,418.25x = 1,380,660.02
  5. Step 5: Solve for x
    x = 1,380,660.02/1,418.25
  6. Step 6: Final answer
    x = 973.50

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1.5x scale

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.