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Finding the Fourth Proportional to 548.64, 821.58 and 418.74

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Solution

The fourth proportional to 548.64, 821.58 and 418.74 is: 627.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    548.64 : 821.58 = 418.74 : x
  2. Step 2: Convert to fraction form
    548.64/821.58 = 418.74/x
  3. Step 3: Cross multiply
    548.64x = 821.58 × 418.74
  4. Step 4: Simplify right side
    548.64x = 344,028.41
  5. Step 5: Solve for x
    x = 344,028.41/548.64
  6. Step 6: Final answer
    x = 627.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.