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Finding the Fourth Proportional to 467.31, 644.46 and 388.88

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Solution

The fourth proportional to 467.31, 644.46 and 388.88 is: 536.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    467.31 : 644.46 = 388.88 : x
  2. Step 2: Convert to fraction form
    467.31/644.46 = 388.88/x
  3. Step 3: Cross multiply
    467.31x = 644.46 × 388.88
  4. Step 4: Simplify right side
    467.31x = 250,620.67
  5. Step 5: Solve for x
    x = 250,620.67/467.31
  6. Step 6: Final answer
    x = 536.31

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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.