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Finding the Fourth Proportional to 773.12, 1,160.04 and 388.40

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Solution

The fourth proportional to 773.12, 1,160.04 and 388.40 is: 582.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.12 : 1,160.04 = 388.40 : x
  2. Step 2: Convert to fraction form
    773.12/1,160.04 = 388.40/x
  3. Step 3: Cross multiply
    773.12x = 1,160.04 × 388.40
  4. Step 4: Simplify right side
    773.12x = 450,559.54
  5. Step 5: Solve for x
    x = 450,559.54/773.12
  6. Step 6: Final answer
    x = 582.78

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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.