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Finding the Fourth Proportional to 812.37, 1,219.58 and 649.86

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Solution

The fourth proportional to 812.37, 1,219.58 and 649.86 is: 975.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.37 : 1,219.58 = 649.86 : x
  2. Step 2: Convert to fraction form
    812.37/1,219.58 = 649.86/x
  3. Step 3: Cross multiply
    812.37x = 1,219.58 × 649.86
  4. Step 4: Simplify right side
    812.37x = 792,553.01
  5. Step 5: Solve for x
    x = 792,553.01/812.37
  6. Step 6: Final answer
    x = 975.61

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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.