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Finding the Fourth Proportional to 812.63, 1,219.15 and 264.87

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Solution

The fourth proportional to 812.63, 1,219.15 and 264.87 is: 397.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.63 : 1,219.15 = 264.87 : x
  2. Step 2: Convert to fraction form
    812.63/1,219.15 = 264.87/x
  3. Step 3: Cross multiply
    812.63x = 1,219.15 × 264.87
  4. Step 4: Simplify right side
    812.63x = 322,916.59
  5. Step 5: Solve for x
    x = 322,916.59/812.63
  6. Step 6: Final answer
    x = 397.37

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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.