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Finding the Fourth Proportional to 634.40, 951.15 and 287.90

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Solution

The fourth proportional to 634.40, 951.15 and 287.90 is: 431.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.40 : 951.15 = 287.90 : x
  2. Step 2: Convert to fraction form
    634.40/951.15 = 287.90/x
  3. Step 3: Cross multiply
    634.40x = 951.15 × 287.90
  4. Step 4: Simplify right side
    634.40x = 273,836.09
  5. Step 5: Solve for x
    x = 273,836.09/634.40
  6. Step 6: Final answer
    x = 431.65

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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.