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Finding the Fourth Proportional to 456.28, 629.40 and 281.50

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Solution

The fourth proportional to 456.28, 629.40 and 281.50 is: 388.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.28 : 629.40 = 281.50 : x
  2. Step 2: Convert to fraction form
    456.28/629.40 = 281.50/x
  3. Step 3: Cross multiply
    456.28x = 629.40 × 281.50
  4. Step 4: Simplify right side
    456.28x = 177,176.10
  5. Step 5: Solve for x
    x = 177,176.10/456.28
  6. Step 6: Final answer
    x = 388.31

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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.