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Finding the Fourth Proportional to 1,920.12, 2,649.90 and 1,092.12

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Solution

The fourth proportional to 1,920.12, 2,649.90 and 1,092.12 is: 1,507.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.12 : 2,649.90 = 1,092.12 : x
  2. Step 2: Convert to fraction form
    1,920.12/2,649.90 = 1,092.12/x
  3. Step 3: Cross multiply
    1,920.12x = 2,649.90 × 1,092.12
  4. Step 4: Simplify right side
    1,920.12x = 2,894,008.79
  5. Step 5: Solve for x
    x = 2,894,008.79/1,920.12
  6. Step 6: Final answer
    x = 1,507.20

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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.