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Finding the Fourth Proportional to 419.57, 578.67 and 270.20

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Solution

The fourth proportional to 419.57, 578.67 and 270.20 is: 372.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.57 : 578.67 = 270.20 : x
  2. Step 2: Convert to fraction form
    419.57/578.67 = 270.20/x
  3. Step 3: Cross multiply
    419.57x = 578.67 × 270.20
  4. Step 4: Simplify right side
    419.57x = 156,357.87
  5. Step 5: Solve for x
    x = 156,357.87/419.57
  6. Step 6: Final answer
    x = 372.66

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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.