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Finding the Fourth Proportional to 1,299.12, 1,791.72 and 856.86

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Solution

The fourth proportional to 1,299.12, 1,791.72 and 856.86 is: 1,181.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.12 : 1,791.72 = 856.86 : x
  2. Step 2: Convert to fraction form
    1,299.12/1,791.72 = 856.86/x
  3. Step 3: Cross multiply
    1,299.12x = 1,791.72 × 856.86
  4. Step 4: Simplify right side
    1,299.12x = 1,535,253.20
  5. Step 5: Solve for x
    x = 1,535,253.20/1,299.12
  6. Step 6: Final answer
    x = 1,181.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.