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Finding the Fourth Proportional to 1,376.90, 1,894.49 and 1,189.79

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Solution

The fourth proportional to 1,376.90, 1,894.49 and 1,189.79 is: 1,637.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.90 : 1,894.49 = 1,189.79 : x
  2. Step 2: Convert to fraction form
    1,376.90/1,894.49 = 1,189.79/x
  3. Step 3: Cross multiply
    1,376.90x = 1,894.49 × 1,189.79
  4. Step 4: Simplify right side
    1,376.90x = 2,254,041.40
  5. Step 5: Solve for x
    x = 2,254,041.40/1,376.90
  6. Step 6: Final answer
    x = 1,637.04

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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.