Home / 2,383.80-3,290.40-1,389.60

Finding the Fourth Proportional to 2,383.80, 3,290.40 and 1,389.60

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Solution

The fourth proportional to 2,383.80, 3,290.40 and 1,389.60 is: 1,918.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,383.80 : 3,290.40 = 1,389.60 : x
  2. Step 2: Convert to fraction form
    2,383.80/3,290.40 = 1,389.60/x
  3. Step 3: Cross multiply
    2,383.80x = 3,290.40 × 1,389.60
  4. Step 4: Simplify right side
    2,383.80x = 4,572,339.84
  5. Step 5: Solve for x
    x = 4,572,339.84/2,383.80
  6. Step 6: Final answer
    x = 1,918.09

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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.