Home / 21,118.23-29,149.64-12,171.68

Finding the Fourth Proportional to 21,118.23, 29,149.64 and 12,171.68

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Solution

The fourth proportional to 21,118.23, 29,149.64 and 12,171.68 is: 16,800.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.23 : 29,149.64 = 12,171.68 : x
  2. Step 2: Convert to fraction form
    21,118.23/29,149.64 = 12,171.68/x
  3. Step 3: Cross multiply
    21,118.23x = 29,149.64 × 12,171.68
  4. Step 4: Simplify right side
    21,118.23x = 354,800,202.51
  5. Step 5: Solve for x
    x = 354,800,202.51/21,118.23
  6. Step 6: Final answer
    x = 16,800.66

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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.