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Finding the Fourth Proportional to 813.19, 1,217.95 and 629.12

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Solution

The fourth proportional to 813.19, 1,217.95 and 629.12 is: 942.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.19 : 1,217.95 = 629.12 : x
  2. Step 2: Convert to fraction form
    813.19/1,217.95 = 629.12/x
  3. Step 3: Cross multiply
    813.19x = 1,217.95 × 629.12
  4. Step 4: Simplify right side
    813.19x = 766,236.70
  5. Step 5: Solve for x
    x = 766,236.70/813.19
  6. Step 6: Final answer
    x = 942.26

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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.