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Finding the Fourth Proportional to 486.66, 671.60 and 276.80

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Solution

The fourth proportional to 486.66, 671.60 and 276.80 is: 381.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    486.66 : 671.60 = 276.80 : x
  2. Step 2: Convert to fraction form
    486.66/671.60 = 276.80/x
  3. Step 3: Cross multiply
    486.66x = 671.60 × 276.80
  4. Step 4: Simplify right side
    486.66x = 185,899.17
  5. Step 5: Solve for x
    x = 185,899.17/486.66
  6. Step 6: Final answer
    x = 381.99

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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.