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Finding the Fourth Proportional to 447, 616.90 and 289.68

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Solution

The fourth proportional to 447, 616.90 and 289.68 is: 399.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    447 : 616.90 = 289.68 : x
  2. Step 2: Convert to fraction form
    447/616.90 = 289.68/x
  3. Step 3: Cross multiply
    447x = 616.90 × 289.68
  4. Step 4: Simplify right side
    447x = 178,703.59
  5. Step 5: Solve for x
    x = 178,703.59/447
  6. Step 6: Final answer
    x = 399.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.