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Finding the Fourth Proportional to 853.92, 1,278.42 and 764.88

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Solution

The fourth proportional to 853.92, 1,278.42 and 764.88 is: 1,145.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    853.92 : 1,278.42 = 764.88 : x
  2. Step 2: Convert to fraction form
    853.92/1,278.42 = 764.88/x
  3. Step 3: Cross multiply
    853.92x = 1,278.42 × 764.88
  4. Step 4: Simplify right side
    853.92x = 977,837.89
  5. Step 5: Solve for x
    x = 977,837.89/853.92
  6. Step 6: Final answer
    x = 1,145.12

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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.