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Finding the Fourth Proportional to 1,412.80, 2,119.80 and 763.39

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Solution

The fourth proportional to 1,412.80, 2,119.80 and 763.39 is: 1,145.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,412.80 : 2,119.80 = 763.39 : x
  2. Step 2: Convert to fraction form
    1,412.80/2,119.80 = 763.39/x
  3. Step 3: Cross multiply
    1,412.80x = 2,119.80 × 763.39
  4. Step 4: Simplify right side
    1,412.80x = 1,618,234.12
  5. Step 5: Solve for x
    x = 1,618,234.12/1,412.80
  6. Step 6: Final answer
    x = 1,145.41

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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.