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Finding the Fourth Proportional to 456.16, 629.60 and 308.80

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Solution

The fourth proportional to 456.16, 629.60 and 308.80 is: 426.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.16 : 629.60 = 308.80 : x
  2. Step 2: Convert to fraction form
    456.16/629.60 = 308.80/x
  3. Step 3: Cross multiply
    456.16x = 629.60 × 308.80
  4. Step 4: Simplify right side
    456.16x = 194,420.48
  5. Step 5: Solve for x
    x = 194,420.48/456.16
  6. Step 6: Final answer
    x = 426.21

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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.