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Finding the Fourth Proportional to 1,386.82, 2,080.86 and 769.96

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Solution

The fourth proportional to 1,386.82, 2,080.86 and 769.96 is: 1,155.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.82 : 2,080.86 = 769.96 : x
  2. Step 2: Convert to fraction form
    1,386.82/2,080.86 = 769.96/x
  3. Step 3: Cross multiply
    1,386.82x = 2,080.86 × 769.96
  4. Step 4: Simplify right side
    1,386.82x = 1,602,178.97
  5. Step 5: Solve for x
    x = 1,602,178.97/1,386.82
  6. Step 6: Final answer
    x = 1,155.29

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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.