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Finding the Fourth Proportional to 21,676.25, 29,914.62 and 12,720.49

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Solution

The fourth proportional to 21,676.25, 29,914.62 and 12,720.49 is: 17,555.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,676.25 : 29,914.62 = 12,720.49 : x
  2. Step 2: Convert to fraction form
    21,676.25/29,914.62 = 12,720.49/x
  3. Step 3: Cross multiply
    21,676.25x = 29,914.62 × 12,720.49
  4. Step 4: Simplify right side
    21,676.25x = 380,528,502.08
  5. Step 5: Solve for x
    x = 380,528,502.08/21,676.25
  6. Step 6: Final answer
    x = 17,555.09

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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.