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Finding the Fourth Proportional to 1,371.64, 2,056.32 and 640.84

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Solution

The fourth proportional to 1,371.64, 2,056.32 and 640.84 is: 960.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.64 : 2,056.32 = 640.84 : x
  2. Step 2: Convert to fraction form
    1,371.64/2,056.32 = 640.84/x
  3. Step 3: Cross multiply
    1,371.64x = 2,056.32 × 640.84
  4. Step 4: Simplify right side
    1,371.64x = 1,317,772.11
  5. Step 5: Solve for x
    x = 1,317,772.11/1,371.64
  6. Step 6: Final answer
    x = 960.73

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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.