Home / 21,720.62-29,971.99-12,159.18

Finding the Fourth Proportional to 21,720.62, 29,971.99 and 12,159.18

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Solution

The fourth proportional to 21,720.62, 29,971.99 and 12,159.18 is: 16,778.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.62 : 29,971.99 = 12,159.18 : x
  2. Step 2: Convert to fraction form
    21,720.62/29,971.99 = 12,159.18/x
  3. Step 3: Cross multiply
    21,720.62x = 29,971.99 × 12,159.18
  4. Step 4: Simplify right side
    21,720.62x = 364,434,836.57
  5. Step 5: Solve for x
    x = 364,434,836.57/21,720.62
  6. Step 6: Final answer
    x = 16,778.29

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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.