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Finding the Fourth Proportional to 13,609.14, 18,780.54 and 7,640.82

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Solution

The fourth proportional to 13,609.14, 18,780.54 and 7,640.82 is: 10,544.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,609.14 : 18,780.54 = 7,640.82 : x
  2. Step 2: Convert to fraction form
    13,609.14/18,780.54 = 7,640.82/x
  3. Step 3: Cross multiply
    13,609.14x = 18,780.54 × 7,640.82
  4. Step 4: Simplify right side
    13,609.14x = 143,498,725.64
  5. Step 5: Solve for x
    x = 143,498,725.64/13,609.14
  6. Step 6: Final answer
    x = 10,544.29

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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.