Home / 21,142.35-29,176.29-12,189.78

Finding the Fourth Proportional to 21,142.35, 29,176.29 and 12,189.78

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Solution

The fourth proportional to 21,142.35, 29,176.29 and 12,189.78 is: 16,821.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142.35 : 29,176.29 = 12,189.78 : x
  2. Step 2: Convert to fraction form
    21,142.35/29,176.29 = 12,189.78/x
  3. Step 3: Cross multiply
    21,142.35x = 29,176.29 × 12,189.78
  4. Step 4: Simplify right side
    21,142.35x = 355,652,556.32
  5. Step 5: Solve for x
    x = 355,652,556.32/21,142.35
  6. Step 6: Final answer
    x = 16,821.81

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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.