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Finding the Fourth Proportional to 815.94, 1,126.56 and 629.13

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Solution

The fourth proportional to 815.94, 1,126.56 and 629.13 is: 868.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.94 : 1,126.56 = 629.13 : x
  2. Step 2: Convert to fraction form
    815.94/1,126.56 = 629.13/x
  3. Step 3: Cross multiply
    815.94x = 1,126.56 × 629.13
  4. Step 4: Simplify right side
    815.94x = 708,752.69
  5. Step 5: Solve for x
    x = 708,752.69/815.94
  6. Step 6: Final answer
    x = 868.63

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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.