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Finding the Fourth Proportional to 13,219.61, 18,241.71 and 7,914.29

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Solution

The fourth proportional to 13,219.61, 18,241.71 and 7,914.29 is: 10,920.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,219.61 : 18,241.71 = 7,914.29 : x
  2. Step 2: Convert to fraction form
    13,219.61/18,241.71 = 7,914.29/x
  3. Step 3: Cross multiply
    13,219.61x = 18,241.71 × 7,914.29
  4. Step 4: Simplify right side
    13,219.61x = 144,370,183.04
  5. Step 5: Solve for x
    x = 144,370,183.04/13,219.61
  6. Step 6: Final answer
    x = 10,920.91

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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.