Home / 21,579.89-29,780.81-12,148.79

Finding the Fourth Proportional to 21,579.89, 29,780.81 and 12,148.79

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Solution

The fourth proportional to 21,579.89, 29,780.81 and 12,148.79 is: 16,765.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579.89 : 29,780.81 = 12,148.79 : x
  2. Step 2: Convert to fraction form
    21,579.89/29,780.81 = 12,148.79/x
  3. Step 3: Cross multiply
    21,579.89x = 29,780.81 × 12,148.79
  4. Step 4: Simplify right side
    21,579.89x = 361,800,745.98
  5. Step 5: Solve for x
    x = 361,800,745.98/21,579.89
  6. Step 6: Final answer
    x = 16,765.64

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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.