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Finding the Fourth Proportional to 851.96, 1,276.70 and 485.97

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Solution

The fourth proportional to 851.96, 1,276.70 and 485.97 is: 728.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.96 : 1,276.70 = 485.97 : x
  2. Step 2: Convert to fraction form
    851.96/1,276.70 = 485.97/x
  3. Step 3: Cross multiply
    851.96x = 1,276.70 × 485.97
  4. Step 4: Simplify right side
    851.96x = 620,435.47
  5. Step 5: Solve for x
    x = 620,435.47/851.96
  6. Step 6: Final answer
    x = 728.25

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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.