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Finding the Fourth Proportional to 812.79, 1,219.23 and 265.05

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Solution

The fourth proportional to 812.79, 1,219.23 and 265.05 is: 397.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.79 : 1,219.23 = 265.05 : x
  2. Step 2: Convert to fraction form
    812.79/1,219.23 = 265.05/x
  3. Step 3: Cross multiply
    812.79x = 1,219.23 × 265.05
  4. Step 4: Simplify right side
    812.79x = 323,156.91
  5. Step 5: Solve for x
    x = 323,156.91/812.79
  6. Step 6: Final answer
    x = 397.59

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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.