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Finding the Fourth Proportional to 12,391.43, 17,094.47 and 7,912.94

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Solution

The fourth proportional to 12,391.43, 17,094.47 and 7,912.94 is: 10,916.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,391.43 : 17,094.47 = 7,912.94 : x
  2. Step 2: Convert to fraction form
    12,391.43/17,094.47 = 7,912.94/x
  3. Step 3: Cross multiply
    12,391.43x = 17,094.47 × 7,912.94
  4. Step 4: Simplify right side
    12,391.43x = 135,267,515.44
  5. Step 5: Solve for x
    x = 135,267,515.44/12,391.43
  6. Step 6: Final answer
    x = 10,916.22

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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.