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Finding the Fourth Proportional to 21,615.71, 29,832.09 and 12,670.78

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Solution

The fourth proportional to 21,615.71, 29,832.09 and 12,670.78 is: 17,487.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,615.71 : 29,832.09 = 12,670.78 : x
  2. Step 2: Convert to fraction form
    21,615.71/29,832.09 = 12,670.78/x
  3. Step 3: Cross multiply
    21,615.71x = 29,832.09 × 12,670.78
  4. Step 4: Simplify right side
    21,615.71x = 377,995,849.33
  5. Step 5: Solve for x
    x = 377,995,849.33/21,615.71
  6. Step 6: Final answer
    x = 17,487.09

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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.