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Finding the Fourth Proportional to 872.95, 1,308.26 and 640.75

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Solution

The fourth proportional to 872.95, 1,308.26 and 640.75 is: 960.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.95 : 1,308.26 = 640.75 : x
  2. Step 2: Convert to fraction form
    872.95/1,308.26 = 640.75/x
  3. Step 3: Cross multiply
    872.95x = 1,308.26 × 640.75
  4. Step 4: Simplify right side
    872.95x = 838,268.38
  5. Step 5: Solve for x
    x = 838,268.38/872.95
  6. Step 6: Final answer
    x = 960.27

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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.