Home / 2,119.60-3,180.60-821.16

Finding the Fourth Proportional to 2,119.60, 3,180.60 and 821.16

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Solution

The fourth proportional to 2,119.60, 3,180.60 and 821.16 is: 1,232.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,119.60 : 3,180.60 = 821.16 : x
  2. Step 2: Convert to fraction form
    2,119.60/3,180.60 = 821.16/x
  3. Step 3: Cross multiply
    2,119.60x = 3,180.60 × 821.16
  4. Step 4: Simplify right side
    2,119.60x = 2,611,781.50
  5. Step 5: Solve for x
    x = 2,611,781.50/2,119.60
  6. Step 6: Final answer
    x = 1,232.20

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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.