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Finding the Fourth Proportional to 1,338.32, 2,004.95 and 642.94

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Solution

The fourth proportional to 1,338.32, 2,004.95 and 642.94 is: 963.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.32 : 2,004.95 = 642.94 : x
  2. Step 2: Convert to fraction form
    1,338.32/2,004.95 = 642.94/x
  3. Step 3: Cross multiply
    1,338.32x = 2,004.95 × 642.94
  4. Step 4: Simplify right side
    1,338.32x = 1,289,059.15
  5. Step 5: Solve for x
    x = 1,289,059.15/1,338.32
  6. Step 6: Final answer
    x = 963.19

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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.