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Finding the Fourth Proportional to 851.10, 1,276.65 and 486.60

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Solution

The fourth proportional to 851.10, 1,276.65 and 486.60 is: 729.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.10 : 1,276.65 = 486.60 : x
  2. Step 2: Convert to fraction form
    851.10/1,276.65 = 486.60/x
  3. Step 3: Cross multiply
    851.10x = 1,276.65 × 486.60
  4. Step 4: Simplify right side
    851.10x = 621,217.89
  5. Step 5: Solve for x
    x = 621,217.89/851.10
  6. Step 6: Final answer
    x = 729.90

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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.