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Finding the Fourth Proportional to 541.20, 811.80 and 379.20

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Solution

The fourth proportional to 541.20, 811.80 and 379.20 is: 568.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.20 : 811.80 = 379.20 : x
  2. Step 2: Convert to fraction form
    541.20/811.80 = 379.20/x
  3. Step 3: Cross multiply
    541.20x = 811.80 × 379.20
  4. Step 4: Simplify right side
    541.20x = 307,834.56
  5. Step 5: Solve for x
    x = 307,834.56/541.20
  6. Step 6: Final answer
    x = 568.80

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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.