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Finding the Fourth Proportional to 456.20, 629.04 and 290.42

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Solution

The fourth proportional to 456.20, 629.04 and 290.42 is: 400.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.20 : 629.04 = 290.42 : x
  2. Step 2: Convert to fraction form
    456.20/629.04 = 290.42/x
  3. Step 3: Cross multiply
    456.20x = 629.04 × 290.42
  4. Step 4: Simplify right side
    456.20x = 182,685.80
  5. Step 5: Solve for x
    x = 182,685.80/456.20
  6. Step 6: Final answer
    x = 400.45

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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.