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Finding the Fourth Proportional to 637.22, 879.30 and 388.60

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Solution

The fourth proportional to 637.22, 879.30 and 388.60 is: 536.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.22 : 879.30 = 388.60 : x
  2. Step 2: Convert to fraction form
    637.22/879.30 = 388.60/x
  3. Step 3: Cross multiply
    637.22x = 879.30 × 388.60
  4. Step 4: Simplify right side
    637.22x = 341,695.98
  5. Step 5: Solve for x
    x = 341,695.98/637.22
  6. Step 6: Final answer
    x = 536.23

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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.