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Finding the Fourth Proportional to 1,975.84, 2,726.79 and 1,189.90

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Solution

The fourth proportional to 1,975.84, 2,726.79 and 1,189.90 is: 1,642.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,975.84 : 2,726.79 = 1,189.90 : x
  2. Step 2: Convert to fraction form
    1,975.84/2,726.79 = 1,189.90/x
  3. Step 3: Cross multiply
    1,975.84x = 2,726.79 × 1,189.90
  4. Step 4: Simplify right side
    1,975.84x = 3,244,607.42
  5. Step 5: Solve for x
    x = 3,244,607.42/1,975.84
  6. Step 6: Final answer
    x = 1,642.14

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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.