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Finding the Fourth Proportional to 640.80, 884.43 and 493.02

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Solution

The fourth proportional to 640.80, 884.43 and 493.02 is: 680.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.80 : 884.43 = 493.02 : x
  2. Step 2: Convert to fraction form
    640.80/884.43 = 493.02/x
  3. Step 3: Cross multiply
    640.80x = 884.43 × 493.02
  4. Step 4: Simplify right side
    640.80x = 436,041.68
  5. Step 5: Solve for x
    x = 436,041.68/640.80
  6. Step 6: Final answer
    x = 680.46

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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.