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Finding the Fourth Proportional to 472.20, 708.90 and 439.90

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Solution

The fourth proportional to 472.20, 708.90 and 439.90 is: 660.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    472.20 : 708.90 = 439.90 : x
  2. Step 2: Convert to fraction form
    472.20/708.90 = 439.90/x
  3. Step 3: Cross multiply
    472.20x = 708.90 × 439.90
  4. Step 4: Simplify right side
    472.20x = 311,845.11
  5. Step 5: Solve for x
    x = 311,845.11/472.20
  6. Step 6: Final answer
    x = 660.41

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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.