Home / 19,431.54-29,128.82-12,391.79

Finding the Fourth Proportional to 19,431.54, 29,128.82 and 12,391.79

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Solution

The fourth proportional to 19,431.54, 29,128.82 and 12,391.79 is: 18,575.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,431.54 : 29,128.82 = 12,391.79 : x
  2. Step 2: Convert to fraction form
    19,431.54/29,128.82 = 12,391.79/x
  3. Step 3: Cross multiply
    19,431.54x = 29,128.82 × 12,391.79
  4. Step 4: Simplify right side
    19,431.54x = 360,958,012.78
  5. Step 5: Solve for x
    x = 360,958,012.78/19,431.54
  6. Step 6: Final answer
    x = 18,575.88

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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.