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Finding the Fourth Proportional to 486.43, 671.36 and 290.05

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Solution

The fourth proportional to 486.43, 671.36 and 290.05 is: 400.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.43 : 671.36 = 290.05 : x
  2. Step 2: Convert to fraction form
    486.43/671.36 = 290.05/x
  3. Step 3: Cross multiply
    486.43x = 671.36 × 290.05
  4. Step 4: Simplify right side
    486.43x = 194,724.84
  5. Step 5: Solve for x
    x = 194,724.84/486.43
  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.