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Finding the Fourth Proportional to 663.56, 988.33 and 628.87

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Solution

The fourth proportional to 663.56, 988.33 and 628.87 is: 936.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.56 : 988.33 = 628.87 : x
  2. Step 2: Convert to fraction form
    663.56/988.33 = 628.87/x
  3. Step 3: Cross multiply
    663.56x = 988.33 × 628.87
  4. Step 4: Simplify right side
    663.56x = 621,527.04
  5. Step 5: Solve for x
    x = 621,527.04/663.56
  6. Step 6: Final answer
    x = 936.65

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.