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Finding the Fourth Proportional to 1,372.56, 2,056.41 and 721.86

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Solution

The fourth proportional to 1,372.56, 2,056.41 and 721.86 is: 1,081.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.56 : 2,056.41 = 721.86 : x
  2. Step 2: Convert to fraction form
    1,372.56/2,056.41 = 721.86/x
  3. Step 3: Cross multiply
    1,372.56x = 2,056.41 × 721.86
  4. Step 4: Simplify right side
    1,372.56x = 1,484,440.12
  5. Step 5: Solve for x
    x = 1,484,440.12/1,372.56
  6. Step 6: Final answer
    x = 1,081.51

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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.