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Finding the Fourth Proportional to 18,091.61, 27,090.68 and 12,486.58

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Solution

The fourth proportional to 18,091.61, 27,090.68 and 12,486.58 is: 18,697.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,091.61 : 27,090.68 = 12,486.58 : x
  2. Step 2: Convert to fraction form
    18,091.61/27,090.68 = 12,486.58/x
  3. Step 3: Cross multiply
    18,091.61x = 27,090.68 × 12,486.58
  4. Step 4: Simplify right side
    18,091.61x = 338,269,943.07
  5. Step 5: Solve for x
    x = 338,269,943.07/18,091.61
  6. Step 6: Final answer
    x = 18,697.61

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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.