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Finding the Fourth Proportional to 638.50, 957.77 and 291.85

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Solution

The fourth proportional to 638.50, 957.77 and 291.85 is: 437.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.50 : 957.77 = 291.85 : x
  2. Step 2: Convert to fraction form
    638.50/957.77 = 291.85/x
  3. Step 3: Cross multiply
    638.50x = 957.77 × 291.85
  4. Step 4: Simplify right side
    638.50x = 279,529.44
  5. Step 5: Solve for x
    x = 279,529.44/638.50
  6. Step 6: Final answer
    x = 437.79

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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.