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Finding the Fourth Proportional to 12,311.72, 16,990.32 and 6,722.72

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Solution

The fourth proportional to 12,311.72, 16,990.32 and 6,722.72 is: 9,277.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,311.72 : 16,990.32 = 6,722.72 : x
  2. Step 2: Convert to fraction form
    12,311.72/16,990.32 = 6,722.72/x
  3. Step 3: Cross multiply
    12,311.72x = 16,990.32 × 6,722.72
  4. Step 4: Simplify right side
    12,311.72x = 114,221,164.07
  5. Step 5: Solve for x
    x = 114,221,164.07/12,311.72
  6. Step 6: Final answer
    x = 9,277.43

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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.