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Finding the Fourth Proportional to 634.20, 951.90 and 391.20

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Solution

The fourth proportional to 634.20, 951.90 and 391.20 is: 587.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.20 : 951.90 = 391.20 : x
  2. Step 2: Convert to fraction form
    634.20/951.90 = 391.20/x
  3. Step 3: Cross multiply
    634.20x = 951.90 × 391.20
  4. Step 4: Simplify right side
    634.20x = 372,383.28
  5. Step 5: Solve for x
    x = 372,383.28/634.20
  6. Step 6: Final answer
    x = 587.17

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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.