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Finding the Fourth Proportional to 813.09, 1,219.31 and 265.13

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Solution

The fourth proportional to 813.09, 1,219.31 and 265.13 is: 397.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.09 : 1,219.31 = 265.13 : x
  2. Step 2: Convert to fraction form
    813.09/1,219.31 = 265.13/x
  3. Step 3: Cross multiply
    813.09x = 1,219.31 × 265.13
  4. Step 4: Simplify right side
    813.09x = 323,268.24
  5. Step 5: Solve for x
    x = 323,268.24/813.09
  6. Step 6: Final answer
    x = 397.58

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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.