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Finding the Fourth Proportional to 419.38, 578.95 and 321.57

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Solution

The fourth proportional to 419.38, 578.95 and 321.57 is: 443.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.38 : 578.95 = 321.57 : x
  2. Step 2: Convert to fraction form
    419.38/578.95 = 321.57/x
  3. Step 3: Cross multiply
    419.38x = 578.95 × 321.57
  4. Step 4: Simplify right side
    419.38x = 186,172.15
  5. Step 5: Solve for x
    x = 186,172.15/419.38
  6. Step 6: Final answer
    x = 443.92

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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.