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Finding the Fourth Proportional to 18,683.40, 27,992.70 and 12,106.20

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Solution

The fourth proportional to 18,683.40, 27,992.70 and 12,106.20 is: 18,138.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,683.40 : 27,992.70 = 12,106.20 : x
  2. Step 2: Convert to fraction form
    18,683.40/27,992.70 = 12,106.20/x
  3. Step 3: Cross multiply
    18,683.40x = 27,992.70 × 12,106.20
  4. Step 4: Simplify right side
    18,683.40x = 338,885,224.74
  5. Step 5: Solve for x
    x = 338,885,224.74/18,683.40
  6. Step 6: Final answer
    x = 18,138.31

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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.