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Finding the Fourth Proportional to 493.62, 680.43 and 388.47

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Solution

The fourth proportional to 493.62, 680.43 and 388.47 is: 535.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.62 : 680.43 = 388.47 : x
  2. Step 2: Convert to fraction form
    493.62/680.43 = 388.47/x
  3. Step 3: Cross multiply
    493.62x = 680.43 × 388.47
  4. Step 4: Simplify right side
    493.62x = 264,326.64
  5. Step 5: Solve for x
    x = 264,326.64/493.62
  6. Step 6: Final answer
    x = 535.49

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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.