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Finding the Fourth Proportional to 427, 637.60 and 399.48

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Solution

The fourth proportional to 427, 637.60 and 399.48 is: 596.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    427 : 637.60 = 399.48 : x
  2. Step 2: Convert to fraction form
    427/637.60 = 399.48/x
  3. Step 3: Cross multiply
    427x = 637.60 × 399.48
  4. Step 4: Simplify right side
    427x = 254,708.45
  5. Step 5: Solve for x
    x = 254,708.45/427
  6. Step 6: Final answer
    x = 596.51

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.