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Finding the Fourth Proportional to 419.76, 579.15 and 286.92

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Solution

The fourth proportional to 419.76, 579.15 and 286.92 is: 395.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.76 : 579.15 = 286.92 : x
  2. Step 2: Convert to fraction form
    419.76/579.15 = 286.92/x
  3. Step 3: Cross multiply
    419.76x = 579.15 × 286.92
  4. Step 4: Simplify right side
    419.76x = 166,169.72
  5. Step 5: Solve for x
    x = 166,169.72/419.76
  6. Step 6: Final answer
    x = 395.87

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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.