Home / 2,190.90-3,279.15-1,931.70

Finding the Fourth Proportional to 2,190.90, 3,279.15 and 1,931.70

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Solution

The fourth proportional to 2,190.90, 3,279.15 and 1,931.70 is: 2,891.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,190.90 : 3,279.15 = 1,931.70 : x
  2. Step 2: Convert to fraction form
    2,190.90/3,279.15 = 1,931.70/x
  3. Step 3: Cross multiply
    2,190.90x = 3,279.15 × 1,931.70
  4. Step 4: Simplify right side
    2,190.90x = 6,334,334.06
  5. Step 5: Solve for x
    x = 6,334,334.06/2,190.90
  6. Step 6: Final answer
    x = 2,891.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.