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Finding the Fourth Proportional to 433.92, 649.68 and 393.60

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Solution

The fourth proportional to 433.92, 649.68 and 393.60 is: 589.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.92 : 649.68 = 393.60 : x
  2. Step 2: Convert to fraction form
    433.92/649.68 = 393.60/x
  3. Step 3: Cross multiply
    433.92x = 649.68 × 393.60
  4. Step 4: Simplify right side
    433.92x = 255,714.05
  5. Step 5: Solve for x
    x = 255,714.05/433.92
  6. Step 6: Final answer
    x = 589.31

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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.