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Finding the Fourth Proportional to 851.90, 1,276.92 and 485.88

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Solution

The fourth proportional to 851.90, 1,276.92 and 485.88 is: 728.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.90 : 1,276.92 = 485.88 : x
  2. Step 2: Convert to fraction form
    851.90/1,276.92 = 485.88/x
  3. Step 3: Cross multiply
    851.90x = 1,276.92 × 485.88
  4. Step 4: Simplify right side
    851.90x = 620,427.46
  5. Step 5: Solve for x
    x = 620,427.46/851.90
  6. Step 6: Final answer
    x = 728.29

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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.