Home / 15,786.45-21,784.66-8,712.78

Finding the Fourth Proportional to 15,786.45, 21,784.66 and 8,712.78

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Solution

The fourth proportional to 15,786.45, 21,784.66 and 8,712.78 is: 12,023.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,786.45 : 21,784.66 = 8,712.78 : x
  2. Step 2: Convert to fraction form
    15,786.45/21,784.66 = 8,712.78/x
  3. Step 3: Cross multiply
    15,786.45x = 21,784.66 × 8,712.78
  4. Step 4: Simplify right side
    15,786.45x = 189,804,949.95
  5. Step 5: Solve for x
    x = 189,804,949.95/15,786.45
  6. Step 6: Final answer
    x = 12,023.28

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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.