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Finding the Fourth Proportional to 638.87, 958.95 and 346.28

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Solution

The fourth proportional to 638.87, 958.95 and 346.28 is: 519.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.87 : 958.95 = 346.28 : x
  2. Step 2: Convert to fraction form
    638.87/958.95 = 346.28/x
  3. Step 3: Cross multiply
    638.87x = 958.95 × 346.28
  4. Step 4: Simplify right side
    638.87x = 332,060.41
  5. Step 5: Solve for x
    x = 332,060.41/638.87
  6. Step 6: Final answer
    x = 519.77

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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.