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Finding the Fourth Proportional to 21,690.27, 29,921.02 and 13,194.99

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Solution

The fourth proportional to 21,690.27, 29,921.02 and 13,194.99 is: 18,202.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.27 : 29,921.02 = 13,194.99 : x
  2. Step 2: Convert to fraction form
    21,690.27/29,921.02 = 13,194.99/x
  3. Step 3: Cross multiply
    21,690.27x = 29,921.02 × 13,194.99
  4. Step 4: Simplify right side
    21,690.27x = 394,807,559.69
  5. Step 5: Solve for x
    x = 394,807,559.69/21,690.27
  6. Step 6: Final answer
    x = 18,202.06

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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.