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Finding the Fourth Proportional to 695.45, 958.96 and 688.43

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Solution

The fourth proportional to 695.45, 958.96 and 688.43 is: 949.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.45 : 958.96 = 688.43 : x
  2. Step 2: Convert to fraction form
    695.45/958.96 = 688.43/x
  3. Step 3: Cross multiply
    695.45x = 958.96 × 688.43
  4. Step 4: Simplify right side
    695.45x = 660,176.83
  5. Step 5: Solve for x
    x = 660,176.83/695.45
  6. Step 6: Final answer
    x = 949.28

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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.