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Finding the Fourth Proportional to 399.88, 548.23 and 392.59

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Solution

The fourth proportional to 399.88, 548.23 and 392.59 is: 538.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.88 : 548.23 = 392.59 : x
  2. Step 2: Convert to fraction form
    399.88/548.23 = 392.59/x
  3. Step 3: Cross multiply
    399.88x = 548.23 × 392.59
  4. Step 4: Simplify right side
    399.88x = 215,229.62
  5. Step 5: Solve for x
    x = 215,229.62/399.88
  6. Step 6: Final answer
    x = 538.24

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.