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Finding the Fourth Proportional to 933.80, 1,399.02 and 640.85

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Solution

The fourth proportional to 933.80, 1,399.02 and 640.85 is: 960.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.80 : 1,399.02 = 640.85 : x
  2. Step 2: Convert to fraction form
    933.80/1,399.02 = 640.85/x
  3. Step 3: Cross multiply
    933.80x = 1,399.02 × 640.85
  4. Step 4: Simplify right side
    933.80x = 896,554.97
  5. Step 5: Solve for x
    x = 896,554.97/933.80
  6. Step 6: Final answer
    x = 960.12

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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.