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Finding the Fourth Proportional to 12,891.10, 18,003.80 and 12,891.10

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Solution

The fourth proportional to 12,891.10, 18,003.80 and 12,891.10 is: 18,003.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.10 : 18,003.80 = 12,891.10 : x
  2. Step 2: Convert to fraction form
    12,891.10/18,003.80 = 12,891.10/x
  3. Step 3: Cross multiply
    12,891.10x = 18,003.80 × 12,891.10
  4. Step 4: Simplify right side
    12,891.10x = 232,088,786.18
  5. Step 5: Solve for x
    x = 232,088,786.18/12,891.10
  6. Step 6: Final answer
    x = 18,003.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.