Home / 13,021.84-19,429.40-12,723.20

Finding the Fourth Proportional to 13,021.84, 19,429.40 and 12,723.20

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Solution

The fourth proportional to 13,021.84, 19,429.40 and 12,723.20 is: 18,983.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,021.84 : 19,429.40 = 12,723.20 : x
  2. Step 2: Convert to fraction form
    13,021.84/19,429.40 = 12,723.20/x
  3. Step 3: Cross multiply
    13,021.84x = 19,429.40 × 12,723.20
  4. Step 4: Simplify right side
    13,021.84x = 247,204,142.08
  5. Step 5: Solve for x
    x = 247,204,142.08/13,021.84
  6. Step 6: Final answer
    x = 18,983.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.