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Finding the Fourth Proportional to 1,920.80, 2,649.40 and 1,173.80

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Solution

The fourth proportional to 1,920.80, 2,649.40 and 1,173.80 is: 1,619.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.80 : 2,649.40 = 1,173.80 : x
  2. Step 2: Convert to fraction form
    1,920.80/2,649.40 = 1,173.80/x
  3. Step 3: Cross multiply
    1,920.80x = 2,649.40 × 1,173.80
  4. Step 4: Simplify right side
    1,920.80x = 3,109,865.72
  5. Step 5: Solve for x
    x = 3,109,865.72/1,920.80
  6. Step 6: Final answer
    x = 1,619.05

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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.