Home / 21,129.30-29,158.38-11,698.20

Finding the Fourth Proportional to 21,129.30, 29,158.38 and 11,698.20

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Solution

The fourth proportional to 21,129.30, 29,158.38 and 11,698.20 is: 16,143.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.30 : 29,158.38 = 11,698.20 : x
  2. Step 2: Convert to fraction form
    21,129.30/29,158.38 = 11,698.20/x
  3. Step 3: Cross multiply
    21,129.30x = 29,158.38 × 11,698.20
  4. Step 4: Simplify right side
    21,129.30x = 341,100,560.92
  5. Step 5: Solve for x
    x = 341,100,560.92/21,129.30
  6. Step 6: Final answer
    x = 16,143.49

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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.