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Finding the Fourth Proportional to 13,491.31, 18,620.25 and 7,829.41

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Solution

The fourth proportional to 13,491.31, 18,620.25 and 7,829.41 is: 10,805.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,491.31 : 18,620.25 = 7,829.41 : x
  2. Step 2: Convert to fraction form
    13,491.31/18,620.25 = 7,829.41/x
  3. Step 3: Cross multiply
    13,491.31x = 18,620.25 × 7,829.41
  4. Step 4: Simplify right side
    13,491.31x = 145,785,571.55
  5. Step 5: Solve for x
    x = 145,785,571.55/13,491.31
  6. Step 6: Final answer
    x = 10,805.89

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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.