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Finding the Fourth Proportional to 933.61, 1,288.83 and 640.39

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Solution

The fourth proportional to 933.61, 1,288.83 and 640.39 is: 884.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.61 : 1,288.83 = 640.39 : x
  2. Step 2: Convert to fraction form
    933.61/1,288.83 = 640.39/x
  3. Step 3: Cross multiply
    933.61x = 1,288.83 × 640.39
  4. Step 4: Simplify right side
    933.61x = 825,353.84
  5. Step 5: Solve for x
    x = 825,353.84/933.61
  6. Step 6: Final answer
    x = 884.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.