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Finding the Fourth Proportional to 20,967.94, 28,940.25 and 12,016.90

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Solution

The fourth proportional to 20,967.94, 28,940.25 and 12,016.90 is: 16,585.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,967.94 : 28,940.25 = 12,016.90 : x
  2. Step 2: Convert to fraction form
    20,967.94/28,940.25 = 12,016.90/x
  3. Step 3: Cross multiply
    20,967.94x = 28,940.25 × 12,016.90
  4. Step 4: Simplify right side
    20,967.94x = 347,772,090.23
  5. Step 5: Solve for x
    x = 347,772,090.23/20,967.94
  6. Step 6: Final answer
    x = 16,585.90

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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.