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Finding the Fourth Proportional to 628.32, 940.80 and 505.92

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Solution

The fourth proportional to 628.32, 940.80 and 505.92 is: 757.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.32 : 940.80 = 505.92 : x
  2. Step 2: Convert to fraction form
    628.32/940.80 = 505.92/x
  3. Step 3: Cross multiply
    628.32x = 940.80 × 505.92
  4. Step 4: Simplify right side
    628.32x = 475,969.54
  5. Step 5: Solve for x
    x = 475,969.54/628.32
  6. Step 6: Final answer
    x = 757.53

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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.