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Finding the Fourth Proportional to 775.86, 1,158.11 and 673.86

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Solution

The fourth proportional to 775.86, 1,158.11 and 673.86 is: 1,005.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.86 : 1,158.11 = 673.86 : x
  2. Step 2: Convert to fraction form
    775.86/1,158.11 = 673.86/x
  3. Step 3: Cross multiply
    775.86x = 1,158.11 × 673.86
  4. Step 4: Simplify right side
    775.86x = 780,400.64
  5. Step 5: Solve for x
    x = 780,400.64/775.86
  6. Step 6: Final answer
    x = 1,005.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.