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Finding the Fourth Proportional to 1,292.64, 1,936.44 and 641.40

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Solution

The fourth proportional to 1,292.64, 1,936.44 and 641.40 is: 960.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.64 : 1,936.44 = 641.40 : x
  2. Step 2: Convert to fraction form
    1,292.64/1,936.44 = 641.40/x
  3. Step 3: Cross multiply
    1,292.64x = 1,936.44 × 641.40
  4. Step 4: Simplify right side
    1,292.64x = 1,242,032.62
  5. Step 5: Solve for x
    x = 1,242,032.62/1,292.64
  6. Step 6: Final answer
    x = 960.85

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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.