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Finding the Fourth Proportional to 456.40, 629.88 and 290.62

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Solution

The fourth proportional to 456.40, 629.88 and 290.62 is: 401.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.40 : 629.88 = 290.62 : x
  2. Step 2: Convert to fraction form
    456.40/629.88 = 290.62/x
  3. Step 3: Cross multiply
    456.40x = 629.88 × 290.62
  4. Step 4: Simplify right side
    456.40x = 183,052.58
  5. Step 5: Solve for x
    x = 183,052.58/456.40
  6. Step 6: Final answer
    x = 401.08

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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.