Home / 21,422.30-29,562.45-11,991.20

Finding the Fourth Proportional to 21,422.30, 29,562.45 and 11,991.20

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Solution

The fourth proportional to 21,422.30, 29,562.45 and 11,991.20 is: 16,547.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,422.30 : 29,562.45 = 11,991.20 : x
  2. Step 2: Convert to fraction form
    21,422.30/29,562.45 = 11,991.20/x
  3. Step 3: Cross multiply
    21,422.30x = 29,562.45 × 11,991.20
  4. Step 4: Simplify right side
    21,422.30x = 354,489,250.44
  5. Step 5: Solve for x
    x = 354,489,250.44/21,422.30
  6. Step 6: Final answer
    x = 16,547.67

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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.