Home / 21,142.38-29,169.36-12,189.68

Finding the Fourth Proportional to 21,142.38, 29,169.36 and 12,189.68

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Solution

The fourth proportional to 21,142.38, 29,169.36 and 12,189.68 is: 16,817.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,142.38 : 29,169.36 = 12,189.68 : x
  2. Step 2: Convert to fraction form
    21,142.38/29,169.36 = 12,189.68/x
  3. Step 3: Cross multiply
    21,142.38x = 29,169.36 × 12,189.68
  4. Step 4: Simplify right side
    21,142.38x = 355,565,018.36
  5. Step 5: Solve for x
    x = 355,565,018.36/21,142.38
  6. Step 6: Final answer
    x = 16,817.64

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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.