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Finding the Fourth Proportional to 486.60, 671.52 and 290.09

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Solution

The fourth proportional to 486.60, 671.52 and 290.09 is: 400.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.60 : 671.52 = 290.09 : x
  2. Step 2: Convert to fraction form
    486.60/671.52 = 290.09/x
  3. Step 3: Cross multiply
    486.60x = 671.52 × 290.09
  4. Step 4: Simplify right side
    486.60x = 194,797.88
  5. Step 5: Solve for x
    x = 194,797.88/486.60
  6. Step 6: Final answer
    x = 400.32

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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.