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Finding the Fourth Proportional to 12,381.56, 16,991.80 and 12,294.08

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Solution

The fourth proportional to 12,381.56, 16,991.80 and 12,294.08 is: 16,871.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,381.56 : 16,991.80 = 12,294.08 : x
  2. Step 2: Convert to fraction form
    12,381.56/16,991.80 = 12,294.08/x
  3. Step 3: Cross multiply
    12,381.56x = 16,991.80 × 12,294.08
  4. Step 4: Simplify right side
    12,381.56x = 208,898,548.54
  5. Step 5: Solve for x
    x = 208,898,548.54/12,381.56
  6. Step 6: Final answer
    x = 16,871.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.