Home / 21,685.92-29,928.64-13,186.16

Finding the Fourth Proportional to 21,685.92, 29,928.64 and 13,186.16

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Solution

The fourth proportional to 21,685.92, 29,928.64 and 13,186.16 is: 18,198.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,685.92 : 29,928.64 = 13,186.16 : x
  2. Step 2: Convert to fraction form
    21,685.92/29,928.64 = 13,186.16/x
  3. Step 3: Cross multiply
    21,685.92x = 29,928.64 × 13,186.16
  4. Step 4: Simplify right side
    21,685.92x = 394,643,835.62
  5. Step 5: Solve for x
    x = 394,643,835.62/21,685.92
  6. Step 6: Final answer
    x = 18,198.16

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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.