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Finding the Fourth Proportional to 439.18, 655.24 and 418.54

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Solution

The fourth proportional to 439.18, 655.24 and 418.54 is: 624.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.18 : 655.24 = 418.54 : x
  2. Step 2: Convert to fraction form
    439.18/655.24 = 418.54/x
  3. Step 3: Cross multiply
    439.18x = 655.24 × 418.54
  4. Step 4: Simplify right side
    439.18x = 274,244.15
  5. Step 5: Solve for x
    x = 274,244.15/439.18
  6. Step 6: Final answer
    x = 624.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.