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Finding the Fourth Proportional to 909.69, 1,254.04 and 629.49

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Solution

The fourth proportional to 909.69, 1,254.04 and 629.49 is: 867.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.69 : 1,254.04 = 629.49 : x
  2. Step 2: Convert to fraction form
    909.69/1,254.04 = 629.49/x
  3. Step 3: Cross multiply
    909.69x = 1,254.04 × 629.49
  4. Step 4: Simplify right side
    909.69x = 789,405.64
  5. Step 5: Solve for x
    x = 789,405.64/909.69
  6. Step 6: Final answer
    x = 867.77

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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.