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Finding the Fourth Proportional to 1,286.53, 1,775.40 and 697.05

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Solution

The fourth proportional to 1,286.53, 1,775.40 and 697.05 is: 961.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.53 : 1,775.40 = 697.05 : x
  2. Step 2: Convert to fraction form
    1,286.53/1,775.40 = 697.05/x
  3. Step 3: Cross multiply
    1,286.53x = 1,775.40 × 697.05
  4. Step 4: Simplify right side
    1,286.53x = 1,237,542.57
  5. Step 5: Solve for x
    x = 1,237,542.57/1,286.53
  6. Step 6: Final answer
    x = 961.92

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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.