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Finding the Fourth Proportional to 486.45, 671.22 and 290.04

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Solution

The fourth proportional to 486.45, 671.22 and 290.04 is: 400.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.45 : 671.22 = 290.04 : x
  2. Step 2: Convert to fraction form
    486.45/671.22 = 290.04/x
  3. Step 3: Cross multiply
    486.45x = 671.22 × 290.04
  4. Step 4: Simplify right side
    486.45x = 194,680.65
  5. Step 5: Solve for x
    x = 194,680.65/486.45
  6. Step 6: Final answer
    x = 400.21

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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.