Home / 21,078.32-29,093.84-13,115.76

Finding the Fourth Proportional to 21,078.32, 29,093.84 and 13,115.76

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Solution

The fourth proportional to 21,078.32, 29,093.84 and 13,115.76 is: 18,103.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,078.32 : 29,093.84 = 13,115.76 : x
  2. Step 2: Convert to fraction form
    21,078.32/29,093.84 = 13,115.76/x
  3. Step 3: Cross multiply
    21,078.32x = 29,093.84 × 13,115.76
  4. Step 4: Simplify right side
    21,078.32x = 381,587,822.92
  5. Step 5: Solve for x
    x = 381,587,822.92/21,078.32
  6. Step 6: Final answer
    x = 18,103.33

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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.