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Finding the Fourth Proportional to 1,420.96, 1,961.12 and 800

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Solution

The fourth proportional to 1,420.96, 1,961.12 and 800 is: 1,104.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.96 : 1,961.12 = 800 : x
  2. Step 2: Convert to fraction form
    1,420.96/1,961.12 = 800/x
  3. Step 3: Cross multiply
    1,420.96x = 1,961.12 × 800
  4. Step 4: Simplify right side
    1,420.96x = 1,568,896
  5. Step 5: Solve for x
    x = 1,568,896/1,420.96
  6. Step 6: Final answer
    x = 1,104.11

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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.