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Finding the Fourth Proportional to 909.94, 1,255.52 and 629.74

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Solution

The fourth proportional to 909.94, 1,255.52 and 629.74 is: 868.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.94 : 1,255.52 = 629.74 : x
  2. Step 2: Convert to fraction form
    909.94/1,255.52 = 629.74/x
  3. Step 3: Cross multiply
    909.94x = 1,255.52 × 629.74
  4. Step 4: Simplify right side
    909.94x = 790,651.16
  5. Step 5: Solve for x
    x = 790,651.16/909.94
  6. Step 6: Final answer
    x = 868.90

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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.