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Finding the Fourth Proportional to 640.32, 959.40 and 274.56

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Solution

The fourth proportional to 640.32, 959.40 and 274.56 is: 411.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.32 : 959.40 = 274.56 : x
  2. Step 2: Convert to fraction form
    640.32/959.40 = 274.56/x
  3. Step 3: Cross multiply
    640.32x = 959.40 × 274.56
  4. Step 4: Simplify right side
    640.32x = 263,412.86
  5. Step 5: Solve for x
    x = 263,412.86/640.32
  6. Step 6: Final answer
    x = 411.38

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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.