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Finding the Fourth Proportional to 936.58, 1,403.51 and 663.21

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Solution

The fourth proportional to 936.58, 1,403.51 and 663.21 is: 993.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.58 : 1,403.51 = 663.21 : x
  2. Step 2: Convert to fraction form
    936.58/1,403.51 = 663.21/x
  3. Step 3: Cross multiply
    936.58x = 1,403.51 × 663.21
  4. Step 4: Simplify right side
    936.58x = 930,821.87
  5. Step 5: Solve for x
    x = 930,821.87/936.58
  6. Step 6: Final answer
    x = 993.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.