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Finding the Fourth Proportional to 637.16, 879.30 and 388.56

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Solution

The fourth proportional to 637.16, 879.30 and 388.56 is: 536.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    637.16 : 879.30 = 388.56 : x
  2. Step 2: Convert to fraction form
    637.16/879.30 = 388.56/x
  3. Step 3: Cross multiply
    637.16x = 879.30 × 388.56
  4. Step 4: Simplify right side
    637.16x = 341,660.81
  5. Step 5: Solve for x
    x = 341,660.81/637.16
  6. Step 6: Final answer
    x = 536.22

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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.