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Finding the Fourth Proportional to 486.55, 671.49 and 290.05

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Solution

The fourth proportional to 486.55, 671.49 and 290.05 is: 400.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.55 : 671.49 = 290.05 : x
  2. Step 2: Convert to fraction form
    486.55/671.49 = 290.05/x
  3. Step 3: Cross multiply
    486.55x = 671.49 × 290.05
  4. Step 4: Simplify right side
    486.55x = 194,765.67
  5. Step 5: Solve for x
    x = 194,765.67/486.55
  6. Step 6: Final answer
    x = 400.30

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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.