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Finding the Fourth Proportional to 447.68, 669.92 and 392.68

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Solution

The fourth proportional to 447.68, 669.92 and 392.68 is: 587.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.68 : 669.92 = 392.68 : x
  2. Step 2: Convert to fraction form
    447.68/669.92 = 392.68/x
  3. Step 3: Cross multiply
    447.68x = 669.92 × 392.68
  4. Step 4: Simplify right side
    447.68x = 263,064.19
  5. Step 5: Solve for x
    x = 263,064.19/447.68
  6. Step 6: Final answer
    x = 587.62

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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.