Home / 2,118.25-2,923.19-1,290.25

Finding the Fourth Proportional to 2,118.25, 2,923.19 and 1,290.25

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Solution

The fourth proportional to 2,118.25, 2,923.19 and 1,290.25 is: 1,780.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.25 : 2,923.19 = 1,290.25 : x
  2. Step 2: Convert to fraction form
    2,118.25/2,923.19 = 1,290.25/x
  3. Step 3: Cross multiply
    2,118.25x = 2,923.19 × 1,290.25
  4. Step 4: Simplify right side
    2,118.25x = 3,771,645.90
  5. Step 5: Solve for x
    x = 3,771,645.90/2,118.25
  6. Step 6: Final answer
    x = 1,780.55

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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.