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Finding the Fourth Proportional to 695.68, 958.08 and 640.96

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Solution

The fourth proportional to 695.68, 958.08 and 640.96 is: 882.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.68 : 958.08 = 640.96 : x
  2. Step 2: Convert to fraction form
    695.68/958.08 = 640.96/x
  3. Step 3: Cross multiply
    695.68x = 958.08 × 640.96
  4. Step 4: Simplify right side
    695.68x = 614,090.96
  5. Step 5: Solve for x
    x = 614,090.96/695.68
  6. Step 6: Final answer
    x = 882.72

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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.