Home / 21,720.12-29,976.39-12,286.86

Finding the Fourth Proportional to 21,720.12, 29,976.39 and 12,286.86

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Solution

The fourth proportional to 21,720.12, 29,976.39 and 12,286.86 is: 16,957.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.12 : 29,976.39 = 12,286.86 : x
  2. Step 2: Convert to fraction form
    21,720.12/29,976.39 = 12,286.86/x
  3. Step 3: Cross multiply
    21,720.12x = 29,976.39 × 12,286.86
  4. Step 4: Simplify right side
    21,720.12x = 368,315,707.24
  5. Step 5: Solve for x
    x = 368,315,707.24/21,720.12
  6. Step 6: Final answer
    x = 16,957.35

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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.