Home / 2,120.78-2,926.62-1,189.28

Finding the Fourth Proportional to 2,120.78, 2,926.62 and 1,189.28

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Solution

The fourth proportional to 2,120.78, 2,926.62 and 1,189.28 is: 1,641.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.78 : 2,926.62 = 1,189.28 : x
  2. Step 2: Convert to fraction form
    2,120.78/2,926.62 = 1,189.28/x
  3. Step 3: Cross multiply
    2,120.78x = 2,926.62 × 1,189.28
  4. Step 4: Simplify right side
    2,120.78x = 3,480,570.63
  5. Step 5: Solve for x
    x = 3,480,570.63/2,120.78
  6. Step 6: Final answer
    x = 1,641.17

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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.