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Finding the Fourth Proportional to 13,383.90, 20,039.40 and 13,019.40

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Solution

The fourth proportional to 13,383.90, 20,039.40 and 13,019.40 is: 19,493.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,383.90 : 20,039.40 = 13,019.40 : x
  2. Step 2: Convert to fraction form
    13,383.90/20,039.40 = 13,019.40/x
  3. Step 3: Cross multiply
    13,383.90x = 20,039.40 × 13,019.40
  4. Step 4: Simplify right side
    13,383.90x = 260,900,964.36
  5. Step 5: Solve for x
    x = 260,900,964.36/13,383.90
  6. Step 6: Final answer
    x = 19,493.64

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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.