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Finding the Fourth Proportional to 419.22, 578.16 and 271.80

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Solution

The fourth proportional to 419.22, 578.16 and 271.80 is: 374.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.22 : 578.16 = 271.80 : x
  2. Step 2: Convert to fraction form
    419.22/578.16 = 271.80/x
  3. Step 3: Cross multiply
    419.22x = 578.16 × 271.80
  4. Step 4: Simplify right side
    419.22x = 157,143.89
  5. Step 5: Solve for x
    x = 157,143.89/419.22
  6. Step 6: Final answer
    x = 374.85

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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.