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Finding the Fourth Proportional to 1,420.92, 2,133.39 and 805.83

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Solution

The fourth proportional to 1,420.92, 2,133.39 and 805.83 is: 1,209.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.92 : 2,133.39 = 805.83 : x
  2. Step 2: Convert to fraction form
    1,420.92/2,133.39 = 805.83/x
  3. Step 3: Cross multiply
    1,420.92x = 2,133.39 × 805.83
  4. Step 4: Simplify right side
    1,420.92x = 1,719,149.66
  5. Step 5: Solve for x
    x = 1,719,149.66/1,420.92
  6. Step 6: Final answer
    x = 1,209.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.