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Finding the Fourth Proportional to 695.94, 960.12 and 640.68

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Solution

The fourth proportional to 695.94, 960.12 and 640.68 is: 883.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.94 : 960.12 = 640.68 : x
  2. Step 2: Convert to fraction form
    695.94/960.12 = 640.68/x
  3. Step 3: Cross multiply
    695.94x = 960.12 × 640.68
  4. Step 4: Simplify right side
    695.94x = 615,129.68
  5. Step 5: Solve for x
    x = 615,129.68/695.94
  6. Step 6: Final answer
    x = 883.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.