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Finding the Fourth Proportional to 12,611.70, 18,931.50 and 10,661.49

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Solution

The fourth proportional to 12,611.70, 18,931.50 and 10,661.49 is: 16,004.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,611.70 : 18,931.50 = 10,661.49 : x
  2. Step 2: Convert to fraction form
    12,611.70/18,931.50 = 10,661.49/x
  3. Step 3: Cross multiply
    12,611.70x = 18,931.50 × 10,661.49
  4. Step 4: Simplify right side
    12,611.70x = 201,837,997.94
  5. Step 5: Solve for x
    x = 201,837,997.94/12,611.70
  6. Step 6: Final answer
    x = 16,004.03

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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.