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Finding the Fourth Proportional to 936.90, 1,404.21 and 663.08

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Solution

The fourth proportional to 936.90, 1,404.21 and 663.08 is: 993.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.90 : 1,404.21 = 663.08 : x
  2. Step 2: Convert to fraction form
    936.90/1,404.21 = 663.08/x
  3. Step 3: Cross multiply
    936.90x = 1,404.21 × 663.08
  4. Step 4: Simplify right side
    936.90x = 931,096.55
  5. Step 5: Solve for x
    x = 931,096.55/936.90
  6. Step 6: Final answer
    x = 993.81

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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.