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Finding the Fourth Proportional to 21,521.88, 29,697.12 and 11,961.12

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Solution

The fourth proportional to 21,521.88, 29,697.12 and 11,961.12 is: 16,504.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,521.88 : 29,697.12 = 11,961.12 : x
  2. Step 2: Convert to fraction form
    21,521.88/29,697.12 = 11,961.12/x
  3. Step 3: Cross multiply
    21,521.88x = 29,697.12 × 11,961.12
  4. Step 4: Simplify right side
    21,521.88x = 355,210,815.97
  5. Step 5: Solve for x
    x = 355,210,815.97/21,521.88
  6. Step 6: Final answer
    x = 16,504.64

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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.