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Finding the Fourth Proportional to 936.53, 1,405.07 and 663.15

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Solution

The fourth proportional to 936.53, 1,405.07 and 663.15 is: 994.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.53 : 1,405.07 = 663.15 : x
  2. Step 2: Convert to fraction form
    936.53/1,405.07 = 663.15/x
  3. Step 3: Cross multiply
    936.53x = 1,405.07 × 663.15
  4. Step 4: Simplify right side
    936.53x = 931,766.80
  5. Step 5: Solve for x
    x = 931,766.80/936.53
  6. Step 6: Final answer
    x = 994.92

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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.