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Finding the Fourth Proportional to 419.64, 628.38 and 354.84

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Solution

The fourth proportional to 419.64, 628.38 and 354.84 is: 531.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.64 : 628.38 = 354.84 : x
  2. Step 2: Convert to fraction form
    419.64/628.38 = 354.84/x
  3. Step 3: Cross multiply
    419.64x = 628.38 × 354.84
  4. Step 4: Simplify right side
    419.64x = 222,974.36
  5. Step 5: Solve for x
    x = 222,974.36/419.64
  6. Step 6: Final answer
    x = 531.35

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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.