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Finding the Fourth Proportional to 637.88, 879.80 and 385.63

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Solution

The fourth proportional to 637.88, 879.80 and 385.63 is: 531.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.88 : 879.80 = 385.63 : x
  2. Step 2: Convert to fraction form
    637.88/879.80 = 385.63/x
  3. Step 3: Cross multiply
    637.88x = 879.80 × 385.63
  4. Step 4: Simplify right side
    637.88x = 339,273.15
  5. Step 5: Solve for x
    x = 339,273.15/637.88
  6. Step 6: Final answer
    x = 531.88

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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.