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Finding the Fourth Proportional to 1,372.86, 2,059.32 and 642.96

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Solution

The fourth proportional to 1,372.86, 2,059.32 and 642.96 is: 964.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.86 : 2,059.32 = 642.96 : x
  2. Step 2: Convert to fraction form
    1,372.86/2,059.32 = 642.96/x
  3. Step 3: Cross multiply
    1,372.86x = 2,059.32 × 642.96
  4. Step 4: Simplify right side
    1,372.86x = 1,324,060.39
  5. Step 5: Solve for x
    x = 1,324,060.39/1,372.86
  6. Step 6: Final answer
    x = 964.45

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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.