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Finding the Fourth Proportional to 486.80, 671.84 and 290.33

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Solution

The fourth proportional to 486.80, 671.84 and 290.33 is: 400.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.80 : 671.84 = 290.33 : x
  2. Step 2: Convert to fraction form
    486.80/671.84 = 290.33/x
  3. Step 3: Cross multiply
    486.80x = 671.84 × 290.33
  4. Step 4: Simplify right side
    486.80x = 195,050.50
  5. Step 5: Solve for x
    x = 195,050.50/486.80
  6. Step 6: Final answer
    x = 400.68

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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.