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Finding the Fourth Proportional to 812.96, 1,219.59 and 265.30

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Solution

The fourth proportional to 812.96, 1,219.59 and 265.30 is: 397.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.96 : 1,219.59 = 265.30 : x
  2. Step 2: Convert to fraction form
    812.96/1,219.59 = 265.30/x
  3. Step 3: Cross multiply
    812.96x = 1,219.59 × 265.30
  4. Step 4: Simplify right side
    812.96x = 323,553.18
  5. Step 5: Solve for x
    x = 323,553.18/812.96
  6. Step 6: Final answer
    x = 397.99

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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.