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Finding the Fourth Proportional to 1,372.08, 2,056.06 and 640.80

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Solution

The fourth proportional to 1,372.08, 2,056.06 and 640.80 is: 960.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.08 : 2,056.06 = 640.80 : x
  2. Step 2: Convert to fraction form
    1,372.08/2,056.06 = 640.80/x
  3. Step 3: Cross multiply
    1,372.08x = 2,056.06 × 640.80
  4. Step 4: Simplify right side
    1,372.08x = 1,317,523.25
  5. Step 5: Solve for x
    x = 1,317,523.25/1,372.08
  6. Step 6: Final answer
    x = 960.24

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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.