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Finding the Fourth Proportional to 11,391.84, 15,720.84 and 6,676.56

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Solution

The fourth proportional to 11,391.84, 15,720.84 and 6,676.56 is: 9,213.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,391.84 : 15,720.84 = 6,676.56 : x
  2. Step 2: Convert to fraction form
    11,391.84/15,720.84 = 6,676.56/x
  3. Step 3: Cross multiply
    11,391.84x = 15,720.84 × 6,676.56
  4. Step 4: Simplify right side
    11,391.84x = 104,961,131.51
  5. Step 5: Solve for x
    x = 104,961,131.51/11,391.84
  6. Step 6: Final answer
    x = 9,213.71

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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.