Home / 21,138.88-29,171.36-12,186.40

Finding the Fourth Proportional to 21,138.88, 29,171.36 and 12,186.40

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Solution

The fourth proportional to 21,138.88, 29,171.36 and 12,186.40 is: 16,817.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.88 : 29,171.36 = 12,186.40 : x
  2. Step 2: Convert to fraction form
    21,138.88/29,171.36 = 12,186.40/x
  3. Step 3: Cross multiply
    21,138.88x = 29,171.36 × 12,186.40
  4. Step 4: Simplify right side
    21,138.88x = 355,493,861.50
  5. Step 5: Solve for x
    x = 355,493,861.50/21,138.88
  6. Step 6: Final answer
    x = 16,817.06

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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.