Home / 20,993.81-31,486.01-12,662.35

Finding the Fourth Proportional to 20,993.81, 31,486.01 and 12,662.35

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Solution

The fourth proportional to 20,993.81, 31,486.01 and 12,662.35 is: 18,990.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.81 : 31,486.01 = 12,662.35 : x
  2. Step 2: Convert to fraction form
    20,993.81/31,486.01 = 12,662.35/x
  3. Step 3: Cross multiply
    20,993.81x = 31,486.01 × 12,662.35
  4. Step 4: Simplify right side
    20,993.81x = 398,686,878.72
  5. Step 5: Solve for x
    x = 398,686,878.72/20,993.81
  6. Step 6: Final answer
    x = 18,990.69

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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.