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Finding the Fourth Proportional to 933.09, 1,396.35 and 639.20

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Solution

The fourth proportional to 933.09, 1,396.35 and 639.20 is: 956.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.09 : 1,396.35 = 639.20 : x
  2. Step 2: Convert to fraction form
    933.09/1,396.35 = 639.20/x
  3. Step 3: Cross multiply
    933.09x = 1,396.35 × 639.20
  4. Step 4: Simplify right side
    933.09x = 892,539.94
  5. Step 5: Solve for x
    x = 892,539.94/933.09
  6. Step 6: Final answer
    x = 956.54

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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.