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Finding the Fourth Proportional to 12,663.72, 18,993.96 and 3,897.90

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Solution

The fourth proportional to 12,663.72, 18,993.96 and 3,897.90 is: 5,846.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,663.72 : 18,993.96 = 3,897.90 : x
  2. Step 2: Convert to fraction form
    12,663.72/18,993.96 = 3,897.90/x
  3. Step 3: Cross multiply
    12,663.72x = 18,993.96 × 3,897.90
  4. Step 4: Simplify right side
    12,663.72x = 74,036,556.68
  5. Step 5: Solve for x
    x = 74,036,556.68/12,663.72
  6. Step 6: Final answer
    x = 5,846.35

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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.