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Finding the Fourth Proportional to 1,286.42, 1,775.86 and 820.94

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Solution

The fourth proportional to 1,286.42, 1,775.86 and 820.94 is: 1,133.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.42 : 1,775.86 = 820.94 : x
  2. Step 2: Convert to fraction form
    1,286.42/1,775.86 = 820.94/x
  3. Step 3: Cross multiply
    1,286.42x = 1,775.86 × 820.94
  4. Step 4: Simplify right side
    1,286.42x = 1,457,863.58
  5. Step 5: Solve for x
    x = 1,457,863.58/1,286.42
  6. Step 6: Final answer
    x = 1,133.28

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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.