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Finding the Fourth Proportional to 20,603.81, 30,911.87 and 14,611.43

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Solution

The fourth proportional to 20,603.81, 30,911.87 and 14,611.43 is: 21,921.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.81 : 30,911.87 = 14,611.43 : x
  2. Step 2: Convert to fraction form
    20,603.81/30,911.87 = 14,611.43/x
  3. Step 3: Cross multiply
    20,603.81x = 30,911.87 × 14,611.43
  4. Step 4: Simplify right side
    20,603.81x = 451,666,738.48
  5. Step 5: Solve for x
    x = 451,666,738.48/20,603.81
  6. Step 6: Final answer
    x = 21,921.51

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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.