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Finding the Fourth Proportional to 419.32, 579.09 and 354.34

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Solution

The fourth proportional to 419.32, 579.09 and 354.34 is: 489.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.32 : 579.09 = 354.34 : x
  2. Step 2: Convert to fraction form
    419.32/579.09 = 354.34/x
  3. Step 3: Cross multiply
    419.32x = 579.09 × 354.34
  4. Step 4: Simplify right side
    419.32x = 205,194.75
  5. Step 5: Solve for x
    x = 205,194.75/419.32
  6. Step 6: Final answer
    x = 489.35

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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.