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Finding the Fourth Proportional to 456.32, 629.28 and 318.08

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Solution

The fourth proportional to 456.32, 629.28 and 318.08 is: 438.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.32 : 629.28 = 318.08 : x
  2. Step 2: Convert to fraction form
    456.32/629.28 = 318.08/x
  3. Step 3: Cross multiply
    456.32x = 629.28 × 318.08
  4. Step 4: Simplify right side
    456.32x = 200,161.38
  5. Step 5: Solve for x
    x = 200,161.38/456.32
  6. Step 6: Final answer
    x = 438.64

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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.