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Finding the Fourth Proportional to 18,078.96, 27,090.48 and 12,543.12

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Solution

The fourth proportional to 18,078.96, 27,090.48 and 12,543.12 is: 18,795.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,078.96 : 27,090.48 = 12,543.12 : x
  2. Step 2: Convert to fraction form
    18,078.96/27,090.48 = 12,543.12/x
  3. Step 3: Cross multiply
    18,078.96x = 27,090.48 × 12,543.12
  4. Step 4: Simplify right side
    18,078.96x = 339,799,141.50
  5. Step 5: Solve for x
    x = 339,799,141.50/18,078.96
  6. Step 6: Final answer
    x = 18,795.28

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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.