Home / 20,992.81-28,968.96-12,039.88

Finding the Fourth Proportional to 20,992.81, 28,968.96 and 12,039.88

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Solution

The fourth proportional to 20,992.81, 28,968.96 and 12,039.88 is: 16,614.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.81 : 28,968.96 = 12,039.88 : x
  2. Step 2: Convert to fraction form
    20,992.81/28,968.96 = 12,039.88/x
  3. Step 3: Cross multiply
    20,992.81x = 28,968.96 × 12,039.88
  4. Step 4: Simplify right side
    20,992.81x = 348,782,802.12
  5. Step 5: Solve for x
    x = 348,782,802.12/20,992.81
  6. Step 6: Final answer
    x = 16,614.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.