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Finding the Fourth Proportional to 813.24, 1,219.86 and 447.83

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Solution

The fourth proportional to 813.24, 1,219.86 and 447.83 is: 671.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.24 : 1,219.86 = 447.83 : x
  2. Step 2: Convert to fraction form
    813.24/1,219.86 = 447.83/x
  3. Step 3: Cross multiply
    813.24x = 1,219.86 × 447.83
  4. Step 4: Simplify right side
    813.24x = 546,288.38
  5. Step 5: Solve for x
    x = 546,288.38/813.24
  6. Step 6: Final answer
    x = 671.74

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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.