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Finding the Fourth Proportional to 640.84, 884.76 and 431.32

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Solution

The fourth proportional to 640.84, 884.76 and 431.32 is: 595.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.84 : 884.76 = 431.32 : x
  2. Step 2: Convert to fraction form
    640.84/884.76 = 431.32/x
  3. Step 3: Cross multiply
    640.84x = 884.76 × 431.32
  4. Step 4: Simplify right side
    640.84x = 381,614.68
  5. Step 5: Solve for x
    x = 381,614.68/640.84
  6. Step 6: Final answer
    x = 595.49

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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.