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Finding the Fourth Proportional to 812.94, 1,121.98 and 459

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Solution

The fourth proportional to 812.94, 1,121.98 and 459 is: 633.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.94 : 1,121.98 = 459 : x
  2. Step 2: Convert to fraction form
    812.94/1,121.98 = 459/x
  3. Step 3: Cross multiply
    812.94x = 1,121.98 × 459
  4. Step 4: Simplify right side
    812.94x = 514,987.24
  5. Step 5: Solve for x
    x = 514,987.24/812.94
  6. Step 6: Final answer
    x = 633.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.