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Finding the Fourth Proportional to 693.15, 958.26 and 687.07

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Solution

The fourth proportional to 693.15, 958.26 and 687.07 is: 949.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.15 : 958.26 = 687.07 : x
  2. Step 2: Convert to fraction form
    693.15/958.26 = 687.07/x
  3. Step 3: Cross multiply
    693.15x = 958.26 × 687.07
  4. Step 4: Simplify right side
    693.15x = 658,391.70
  5. Step 5: Solve for x
    x = 658,391.70/693.15
  6. Step 6: Final answer
    x = 949.85

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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.