Home / 21,141.88-29,175.50-12,189.40

Finding the Fourth Proportional to 21,141.88, 29,175.50 and 12,189.40

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Solution

The fourth proportional to 21,141.88, 29,175.50 and 12,189.40 is: 16,821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,141.88 : 29,175.50 = 12,189.40 : x
  2. Step 2: Convert to fraction form
    21,141.88/29,175.50 = 12,189.40/x
  3. Step 3: Cross multiply
    21,141.88x = 29,175.50 × 12,189.40
  4. Step 4: Simplify right side
    21,141.88x = 355,631,839.70
  5. Step 5: Solve for x
    x = 355,631,839.70/21,141.88
  6. Step 6: Final answer
    x = 16,821.20

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Double scale
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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.