Home / 21,918.86-30,249.87-13,420.94

Finding the Fourth Proportional to 21,918.86, 30,249.87 and 13,420.94

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Solution

The fourth proportional to 21,918.86, 30,249.87 and 13,420.94 is: 18,522.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.86 : 30,249.87 = 13,420.94 : x
  2. Step 2: Convert to fraction form
    21,918.86/30,249.87 = 13,420.94/x
  3. Step 3: Cross multiply
    21,918.86x = 30,249.87 × 13,420.94
  4. Step 4: Simplify right side
    21,918.86x = 405,981,690.28
  5. Step 5: Solve for x
    x = 405,981,690.28/21,918.86
  6. Step 6: Final answer
    x = 18,522.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.