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Finding the Fourth Proportional to 851.65, 1,277.11 and 324.47

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Solution

The fourth proportional to 851.65, 1,277.11 and 324.47 is: 486.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.65 : 1,277.11 = 324.47 : x
  2. Step 2: Convert to fraction form
    851.65/1,277.11 = 324.47/x
  3. Step 3: Cross multiply
    851.65x = 1,277.11 × 324.47
  4. Step 4: Simplify right side
    851.65x = 414,383.10
  5. Step 5: Solve for x
    x = 414,383.10/851.65
  6. Step 6: Final answer
    x = 486.56

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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.