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Finding the Fourth Proportional to 19,181.80, 28,742.86 and 7,329.11

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Solution

The fourth proportional to 19,181.80, 28,742.86 and 7,329.11 is: 10,982.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,181.80 : 28,742.86 = 7,329.11 : x
  2. Step 2: Convert to fraction form
    19,181.80/28,742.86 = 7,329.11/x
  3. Step 3: Cross multiply
    19,181.80x = 28,742.86 × 7,329.11
  4. Step 4: Simplify right side
    19,181.80x = 210,659,402.29
  5. Step 5: Solve for x
    x = 210,659,402.29/19,181.80
  6. Step 6: Final answer
    x = 10,982.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.