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Finding the Fourth Proportional to 813.21, 1,219.80 and 236.07

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Solution

The fourth proportional to 813.21, 1,219.80 and 236.07 is: 354.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.21 : 1,219.80 = 236.07 : x
  2. Step 2: Convert to fraction form
    813.21/1,219.80 = 236.07/x
  3. Step 3: Cross multiply
    813.21x = 1,219.80 × 236.07
  4. Step 4: Simplify right side
    813.21x = 287,958.19
  5. Step 5: Solve for x
    x = 287,958.19/813.21
  6. Step 6: Final answer
    x = 354.10

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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.