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Finding the Fourth Proportional to 638.75, 957.86 and 292.31

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Solution

The fourth proportional to 638.75, 957.86 and 292.31 is: 438.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.75 : 957.86 = 292.31 : x
  2. Step 2: Convert to fraction form
    638.75/957.86 = 292.31/x
  3. Step 3: Cross multiply
    638.75x = 957.86 × 292.31
  4. Step 4: Simplify right side
    638.75x = 279,990.49
  5. Step 5: Solve for x
    x = 279,990.49/638.75
  6. Step 6: Final answer
    x = 438.34

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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.