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Finding the Fourth Proportional to 933.90, 1,288.39 and 579.70

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Solution

The fourth proportional to 933.90, 1,288.39 and 579.70 is: 799.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.90 : 1,288.39 = 579.70 : x
  2. Step 2: Convert to fraction form
    933.90/1,288.39 = 579.70/x
  3. Step 3: Cross multiply
    933.90x = 1,288.39 × 579.70
  4. Step 4: Simplify right side
    933.90x = 746,879.68
  5. Step 5: Solve for x
    x = 746,879.68/933.90
  6. Step 6: Final answer
    x = 799.74

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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.