Home / 20,921.90-28,873.13-11,972.21

Finding the Fourth Proportional to 20,921.90, 28,873.13 and 11,972.21

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Solution

The fourth proportional to 20,921.90, 28,873.13 and 11,972.21 is: 16,522.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.90 : 28,873.13 = 11,972.21 : x
  2. Step 2: Convert to fraction form
    20,921.90/28,873.13 = 11,972.21/x
  3. Step 3: Cross multiply
    20,921.90x = 28,873.13 × 11,972.21
  4. Step 4: Simplify right side
    20,921.90x = 345,674,971.49
  5. Step 5: Solve for x
    x = 345,674,971.49/20,921.90
  6. Step 6: Final answer
    x = 16,522.16

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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.