Home / 12,721.20-19,081.80-3,361.20

Finding the Fourth Proportional to 12,721.20, 19,081.80 and 3,361.20

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Solution

The fourth proportional to 12,721.20, 19,081.80 and 3,361.20 is: 5,041.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,721.20 : 19,081.80 = 3,361.20 : x
  2. Step 2: Convert to fraction form
    12,721.20/19,081.80 = 3,361.20/x
  3. Step 3: Cross multiply
    12,721.20x = 19,081.80 × 3,361.20
  4. Step 4: Simplify right side
    12,721.20x = 64,137,746.16
  5. Step 5: Solve for x
    x = 64,137,746.16/12,721.20
  6. Step 6: Final answer
    x = 5,041.80

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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.