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Finding the Fourth Proportional to 12,912.79, 19,367.06 and 12,072.21

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Solution

The fourth proportional to 12,912.79, 19,367.06 and 12,072.21 is: 18,106.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,912.79 : 19,367.06 = 12,072.21 : x
  2. Step 2: Convert to fraction form
    12,912.79/19,367.06 = 12,072.21/x
  3. Step 3: Cross multiply
    12,912.79x = 19,367.06 × 12,072.21
  4. Step 4: Simplify right side
    12,912.79x = 233,803,155.04
  5. Step 5: Solve for x
    x = 233,803,155.04/12,912.79
  6. Step 6: Final answer
    x = 18,106.33

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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.