Home / 21,120.84-29,144.20-12,171.24

Finding the Fourth Proportional to 21,120.84, 29,144.20 and 12,171.24

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Solution

The fourth proportional to 21,120.84, 29,144.20 and 12,171.24 is: 16,794.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.84 : 29,144.20 = 12,171.24 : x
  2. Step 2: Convert to fraction form
    21,120.84/29,144.20 = 12,171.24/x
  3. Step 3: Cross multiply
    21,120.84x = 29,144.20 × 12,171.24
  4. Step 4: Simplify right side
    21,120.84x = 354,721,052.81
  5. Step 5: Solve for x
    x = 354,721,052.81/21,120.84
  6. Step 6: Final answer
    x = 16,794.84

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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.