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Finding the Fourth Proportional to 439.81, 609.72 and 416.40

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Solution

The fourth proportional to 439.81, 609.72 and 416.40 is: 577.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.81 : 609.72 = 416.40 : x
  2. Step 2: Convert to fraction form
    439.81/609.72 = 416.40/x
  3. Step 3: Cross multiply
    439.81x = 609.72 × 416.40
  4. Step 4: Simplify right side
    439.81x = 253,885.85
  5. Step 5: Solve for x
    x = 253,885.85/439.81
  6. Step 6: Final answer
    x = 577.27

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.