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Finding the Fourth Proportional to 13,428.97, 18,531.21 and 7,763.97

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Solution

The fourth proportional to 13,428.97, 18,531.21 and 7,763.97 is: 10,713.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,428.97 : 18,531.21 = 7,763.97 : x
  2. Step 2: Convert to fraction form
    13,428.97/18,531.21 = 7,763.97/x
  3. Step 3: Cross multiply
    13,428.97x = 18,531.21 × 7,763.97
  4. Step 4: Simplify right side
    13,428.97x = 143,875,758.50
  5. Step 5: Solve for x
    x = 143,875,758.50/13,428.97
  6. Step 6: Final answer
    x = 10,713.83

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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.