Home / 13,820.13-18,919.19-13,721.31

Finding the Fourth Proportional to 13,820.13, 18,919.19 and 13,721.31

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Solution

The fourth proportional to 13,820.13, 18,919.19 and 13,721.31 is: 18,783.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,820.13 : 18,919.19 = 13,721.31 : x
  2. Step 2: Convert to fraction form
    13,820.13/18,919.19 = 13,721.31/x
  3. Step 3: Cross multiply
    13,820.13x = 18,919.19 × 13,721.31
  4. Step 4: Simplify right side
    13,820.13x = 259,596,105.24
  5. Step 5: Solve for x
    x = 259,596,105.24/13,820.13
  6. Step 6: Final answer
    x = 18,783.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.