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Finding the Fourth Proportional to 13,709.82, 18,919.64 and 7,422.20

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Solution

The fourth proportional to 13,709.82, 18,919.64 and 7,422.20 is: 10,242.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,709.82 : 18,919.64 = 7,422.20 : x
  2. Step 2: Convert to fraction form
    13,709.82/18,919.64 = 7,422.20/x
  3. Step 3: Cross multiply
    13,709.82x = 18,919.64 × 7,422.20
  4. Step 4: Simplify right side
    13,709.82x = 140,425,275.97
  5. Step 5: Solve for x
    x = 140,425,275.97/13,709.82
  6. Step 6: Final answer
    x = 10,242.68

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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.