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Finding the Fourth Proportional to 851.44, 1,277.24 and 486.40

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Solution

The fourth proportional to 851.44, 1,277.24 and 486.40 is: 729.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.44 : 1,277.24 = 486.40 : x
  2. Step 2: Convert to fraction form
    851.44/1,277.24 = 486.40/x
  3. Step 3: Cross multiply
    851.44x = 1,277.24 × 486.40
  4. Step 4: Simplify right side
    851.44x = 621,249.54
  5. Step 5: Solve for x
    x = 621,249.54/851.44
  6. Step 6: Final answer
    x = 729.65

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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.