Home / 2,188.40-3,020.48-1,391.57

Finding the Fourth Proportional to 2,188.40, 3,020.48 and 1,391.57

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Solution

The fourth proportional to 2,188.40, 3,020.48 and 1,391.57 is: 1,920.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,188.40 : 3,020.48 = 1,391.57 : x
  2. Step 2: Convert to fraction form
    2,188.40/3,020.48 = 1,391.57/x
  3. Step 3: Cross multiply
    2,188.40x = 3,020.48 × 1,391.57
  4. Step 4: Simplify right side
    2,188.40x = 4,203,203.84
  5. Step 5: Solve for x
    x = 4,203,203.84/2,188.40
  6. Step 6: Final answer
    x = 1,920.68

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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.