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Finding the Fourth Proportional to 12,896.75, 17,801.31 and 8,421.20

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Solution

The fourth proportional to 12,896.75, 17,801.31 and 8,421.20 is: 11,623.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,896.75 : 17,801.31 = 8,421.20 : x
  2. Step 2: Convert to fraction form
    12,896.75/17,801.31 = 8,421.20/x
  3. Step 3: Cross multiply
    12,896.75x = 17,801.31 × 8,421.20
  4. Step 4: Simplify right side
    12,896.75x = 149,908,302.77
  5. Step 5: Solve for x
    x = 149,908,302.77/12,896.75
  6. Step 6: Final answer
    x = 11,623.73

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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.