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Finding the Fourth Proportional to 640.27, 883.61 and 378.28

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Solution

The fourth proportional to 640.27, 883.61 and 378.28 is: 522.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.27 : 883.61 = 378.28 : x
  2. Step 2: Convert to fraction form
    640.27/883.61 = 378.28/x
  3. Step 3: Cross multiply
    640.27x = 883.61 × 378.28
  4. Step 4: Simplify right side
    640.27x = 334,251.99
  5. Step 5: Solve for x
    x = 334,251.99/640.27
  6. Step 6: Final answer
    x = 522.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.