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Finding the Fourth Proportional to 1,921.62, 2,878.11 and 1,189.11

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Solution

The fourth proportional to 1,921.62, 2,878.11 and 1,189.11 is: 1,780.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.62 : 2,878.11 = 1,189.11 : x
  2. Step 2: Convert to fraction form
    1,921.62/2,878.11 = 1,189.11/x
  3. Step 3: Cross multiply
    1,921.62x = 2,878.11 × 1,189.11
  4. Step 4: Simplify right side
    1,921.62x = 3,422,389.38
  5. Step 5: Solve for x
    x = 3,422,389.38/1,921.62
  6. Step 6: Final answer
    x = 1,780.99

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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.