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Finding the Fourth Proportional to 663.13, 987.68 and 628.43

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Solution

The fourth proportional to 663.13, 987.68 and 628.43 is: 936.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.13 : 987.68 = 628.43 : x
  2. Step 2: Convert to fraction form
    663.13/987.68 = 628.43/x
  3. Step 3: Cross multiply
    663.13x = 987.68 × 628.43
  4. Step 4: Simplify right side
    663.13x = 620,687.74
  5. Step 5: Solve for x
    x = 620,687.74/663.13
  6. Step 6: Final answer
    x = 936.00

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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.