Home / 21,579.32-29,782.30-12,149.72

Finding the Fourth Proportional to 21,579.32, 29,782.30 and 12,149.72

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Solution

The fourth proportional to 21,579.32, 29,782.30 and 12,149.72 is: 16,768.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,579.32 : 29,782.30 = 12,149.72 : x
  2. Step 2: Convert to fraction form
    21,579.32/29,782.30 = 12,149.72/x
  3. Step 3: Cross multiply
    21,579.32x = 29,782.30 × 12,149.72
  4. Step 4: Simplify right side
    21,579.32x = 361,846,605.96
  5. Step 5: Solve for x
    x = 361,846,605.96/21,579.32
  6. Step 6: Final answer
    x = 16,768.21

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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.