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Finding the Fourth Proportional to 12,728.88, 18,989.97 and 12,039.98

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Solution

The fourth proportional to 12,728.88, 18,989.97 and 12,039.98 is: 17,962.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,728.88 : 18,989.97 = 12,039.98 : x
  2. Step 2: Convert to fraction form
    12,728.88/18,989.97 = 12,039.98/x
  3. Step 3: Cross multiply
    12,728.88x = 18,989.97 × 12,039.98
  4. Step 4: Simplify right side
    12,728.88x = 228,638,764.05
  5. Step 5: Solve for x
    x = 228,638,764.05/12,728.88
  6. Step 6: Final answer
    x = 17,962.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.