Home / 21,168.10-29,145.10-18,640.90

Finding the Fourth Proportional to 21,168.10, 29,145.10 and 18,640.90

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Solution

The fourth proportional to 21,168.10, 29,145.10 and 18,640.90 is: 25,665.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168.10 : 29,145.10 = 18,640.90 : x
  2. Step 2: Convert to fraction form
    21,168.10/29,145.10 = 18,640.90/x
  3. Step 3: Cross multiply
    21,168.10x = 29,145.10 × 18,640.90
  4. Step 4: Simplify right side
    21,168.10x = 543,290,655.66
  5. Step 5: Solve for x
    x = 543,290,655.66/21,168.10
  6. Step 6: Final answer
    x = 25,665.54

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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.