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Finding the Fourth Proportional to 311.25, 467.28 and 289.85

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Solution

The fourth proportional to 311.25, 467.28 and 289.85 is: 435.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.25 : 467.28 = 289.85 : x
  2. Step 2: Convert to fraction form
    311.25/467.28 = 289.85/x
  3. Step 3: Cross multiply
    311.25x = 467.28 × 289.85
  4. Step 4: Simplify right side
    311.25x = 135,442.28
  5. Step 5: Solve for x
    x = 135,442.28/311.25
  6. Step 6: Final answer
    x = 435.16

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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.