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Finding the Fourth Proportional to 851.60, 1,276.37 and 388.75

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Solution

The fourth proportional to 851.60, 1,276.37 and 388.75 is: 582.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.60 : 1,276.37 = 388.75 : x
  2. Step 2: Convert to fraction form
    851.60/1,276.37 = 388.75/x
  3. Step 3: Cross multiply
    851.60x = 1,276.37 × 388.75
  4. Step 4: Simplify right side
    851.60x = 496,188.84
  5. Step 5: Solve for x
    x = 496,188.84/851.60
  6. Step 6: Final answer
    x = 582.65

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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.