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Finding the Fourth Proportional to 12,661.80, 18,992.70 and 12,588.90

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Solution

The fourth proportional to 12,661.80, 18,992.70 and 12,588.90 is: 18,883.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,661.80 : 18,992.70 = 12,588.90 : x
  2. Step 2: Convert to fraction form
    12,661.80/18,992.70 = 12,588.90/x
  3. Step 3: Cross multiply
    12,661.80x = 18,992.70 × 12,588.90
  4. Step 4: Simplify right side
    12,661.80x = 239,097,201.03
  5. Step 5: Solve for x
    x = 239,097,201.03/12,661.80
  6. Step 6: Final answer
    x = 18,883.35

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Similar ratio
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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.