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Finding the Fourth Proportional to 1,212.36, 1,816.08 and 634

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Solution

The fourth proportional to 1,212.36, 1,816.08 and 634 is: 949.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.36 : 1,816.08 = 634 : x
  2. Step 2: Convert to fraction form
    1,212.36/1,816.08 = 634/x
  3. Step 3: Cross multiply
    1,212.36x = 1,816.08 × 634
  4. Step 4: Simplify right side
    1,212.36x = 1,151,394.72
  5. Step 5: Solve for x
    x = 1,151,394.72/1,212.36
  6. Step 6: Final answer
    x = 949.71

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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.