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Finding the Fourth Proportional to 640.08, 959.31 and 292.91

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Solution

The fourth proportional to 640.08, 959.31 and 292.91 is: 438.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.08 : 959.31 = 292.91 : x
  2. Step 2: Convert to fraction form
    640.08/959.31 = 292.91/x
  3. Step 3: Cross multiply
    640.08x = 959.31 × 292.91
  4. Step 4: Simplify right side
    640.08x = 280,986.70
  5. Step 5: Solve for x
    x = 280,986.70/640.08
  6. Step 6: Final answer
    x = 438.99

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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.