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Finding the Fourth Proportional to 541.98, 811.71 and 419.85

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Solution

The fourth proportional to 541.98, 811.71 and 419.85 is: 628.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.98 : 811.71 = 419.85 : x
  2. Step 2: Convert to fraction form
    541.98/811.71 = 419.85/x
  3. Step 3: Cross multiply
    541.98x = 811.71 × 419.85
  4. Step 4: Simplify right side
    541.98x = 340,796.44
  5. Step 5: Solve for x
    x = 340,796.44/541.98
  6. Step 6: Final answer
    x = 628.80

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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.