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Finding the Fourth Proportional to 13,215.92, 18,241.44 and 7,914.88

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Solution

The fourth proportional to 13,215.92, 18,241.44 and 7,914.88 is: 10,924.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,215.92 : 18,241.44 = 7,914.88 : x
  2. Step 2: Convert to fraction form
    13,215.92/18,241.44 = 7,914.88/x
  3. Step 3: Cross multiply
    13,215.92x = 18,241.44 × 7,914.88
  4. Step 4: Simplify right side
    13,215.92x = 144,378,808.63
  5. Step 5: Solve for x
    x = 144,378,808.63/13,215.92
  6. Step 6: Final answer
    x = 10,924.61

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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.