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Finding the Fourth Proportional to 1,372.78, 2,059.84 and 642.23

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Solution

The fourth proportional to 1,372.78, 2,059.84 and 642.23 is: 963.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.78 : 2,059.84 = 642.23 : x
  2. Step 2: Convert to fraction form
    1,372.78/2,059.84 = 642.23/x
  3. Step 3: Cross multiply
    1,372.78x = 2,059.84 × 642.23
  4. Step 4: Simplify right side
    1,372.78x = 1,322,880.74
  5. Step 5: Solve for x
    x = 1,322,880.74/1,372.78
  6. Step 6: Final answer
    x = 963.65

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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.