Home / 21,721.12-29,977.77-12,287.86

Finding the Fourth Proportional to 21,721.12, 29,977.77 and 12,287.86

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Solution

The fourth proportional to 21,721.12, 29,977.77 and 12,287.86 is: 16,958.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.12 : 29,977.77 = 12,287.86 : x
  2. Step 2: Convert to fraction form
    21,721.12/29,977.77 = 12,287.86/x
  3. Step 3: Cross multiply
    21,721.12x = 29,977.77 × 12,287.86
  4. Step 4: Simplify right side
    21,721.12x = 368,362,640.87
  5. Step 5: Solve for x
    x = 368,362,640.87/21,721.12
  6. Step 6: Final answer
    x = 16,958.73

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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.