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Finding the Fourth Proportional to 813.12, 1,219.71 and 228.12

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Solution

The fourth proportional to 813.12, 1,219.71 and 228.12 is: 342.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.12 : 1,219.71 = 228.12 : x
  2. Step 2: Convert to fraction form
    813.12/1,219.71 = 228.12/x
  3. Step 3: Cross multiply
    813.12x = 1,219.71 × 228.12
  4. Step 4: Simplify right side
    813.12x = 278,240.25
  5. Step 5: Solve for x
    x = 278,240.25/813.12
  6. Step 6: Final answer
    x = 342.19

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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.