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Finding the Fourth Proportional to 419.60, 578.57 and 331.08

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Solution

The fourth proportional to 419.60, 578.57 and 331.08 is: 456.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.60 : 578.57 = 331.08 : x
  2. Step 2: Convert to fraction form
    419.60/578.57 = 331.08/x
  3. Step 3: Cross multiply
    419.60x = 578.57 × 331.08
  4. Step 4: Simplify right side
    419.60x = 191,551.30
  5. Step 5: Solve for x
    x = 191,551.30/419.60
  6. Step 6: Final answer
    x = 456.51

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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.