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Finding the Fourth Proportional to 304.28, 419.55 and 287.87

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Solution

The fourth proportional to 304.28, 419.55 and 287.87 is: 396.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.28 : 419.55 = 287.87 : x
  2. Step 2: Convert to fraction form
    304.28/419.55 = 287.87/x
  3. Step 3: Cross multiply
    304.28x = 419.55 × 287.87
  4. Step 4: Simplify right side
    304.28x = 120,775.70
  5. Step 5: Solve for x
    x = 120,775.70/304.28
  6. Step 6: Final answer
    x = 396.92

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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.