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Finding the Fourth Proportional to 21,392.64, 32,087.88 and 12,512.88

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Solution

The fourth proportional to 21,392.64, 32,087.88 and 12,512.88 is: 18,768.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,392.64 : 32,087.88 = 12,512.88 : x
  2. Step 2: Convert to fraction form
    21,392.64/32,087.88 = 12,512.88/x
  3. Step 3: Cross multiply
    21,392.64x = 32,087.88 × 12,512.88
  4. Step 4: Simplify right side
    21,392.64x = 401,511,791.89
  5. Step 5: Solve for x
    x = 401,511,791.89/21,392.64
  6. Step 6: Final answer
    x = 18,768.69

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.