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Finding the Fourth Proportional to 933.21, 1,287.55 and 579.39

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Solution

The fourth proportional to 933.21, 1,287.55 and 579.39 is: 799.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.21 : 1,287.55 = 579.39 : x
  2. Step 2: Convert to fraction form
    933.21/1,287.55 = 579.39/x
  3. Step 3: Cross multiply
    933.21x = 1,287.55 × 579.39
  4. Step 4: Simplify right side
    933.21x = 745,993.59
  5. Step 5: Solve for x
    x = 745,993.59/933.21
  6. Step 6: Final answer
    x = 799.38

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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.