Home / 2,188.47-3,020.58-1,391.64

Finding the Fourth Proportional to 2,188.47, 3,020.58 and 1,391.64

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Solution

The fourth proportional to 2,188.47, 3,020.58 and 1,391.64 is: 1,920.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,188.47 : 3,020.58 = 1,391.64 : x
  2. Step 2: Convert to fraction form
    2,188.47/3,020.58 = 1,391.64/x
  3. Step 3: Cross multiply
    2,188.47x = 3,020.58 × 1,391.64
  4. Step 4: Simplify right side
    2,188.47x = 4,203,559.95
  5. Step 5: Solve for x
    x = 4,203,559.95/2,188.47
  6. Step 6: Final answer
    x = 1,920.78

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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.