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Finding the Fourth Proportional to 637.74, 879.81 and 388.96

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Solution

The fourth proportional to 637.74, 879.81 and 388.96 is: 536.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.74 : 879.81 = 388.96 : x
  2. Step 2: Convert to fraction form
    637.74/879.81 = 388.96/x
  3. Step 3: Cross multiply
    637.74x = 879.81 × 388.96
  4. Step 4: Simplify right side
    637.74x = 342,210.90
  5. Step 5: Solve for x
    x = 342,210.90/637.74
  6. Step 6: Final answer
    x = 536.60

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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.