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Finding the Fourth Proportional to 1,291.38, 1,935.18 and 640.82

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Solution

The fourth proportional to 1,291.38, 1,935.18 and 640.82 is: 960.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.38 : 1,935.18 = 640.82 : x
  2. Step 2: Convert to fraction form
    1,291.38/1,935.18 = 640.82/x
  3. Step 3: Cross multiply
    1,291.38x = 1,935.18 × 640.82
  4. Step 4: Simplify right side
    1,291.38x = 1,240,102.05
  5. Step 5: Solve for x
    x = 1,240,102.05/1,291.38
  6. Step 6: Final answer
    x = 960.29

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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.