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Finding the Fourth Proportional to 939.52, 1,295.84 and 629.12

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Solution

The fourth proportional to 939.52, 1,295.84 and 629.12 is: 867.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.52 : 1,295.84 = 629.12 : x
  2. Step 2: Convert to fraction form
    939.52/1,295.84 = 629.12/x
  3. Step 3: Cross multiply
    939.52x = 1,295.84 × 629.12
  4. Step 4: Simplify right side
    939.52x = 815,238.86
  5. Step 5: Solve for x
    x = 815,238.86/939.52
  6. Step 6: Final answer
    x = 867.72

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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.