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Finding the Fourth Proportional to 400.01, 548.40 and 392.72

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Solution

The fourth proportional to 400.01, 548.40 and 392.72 is: 538.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.01 : 548.40 = 392.72 : x
  2. Step 2: Convert to fraction form
    400.01/548.40 = 392.72/x
  3. Step 3: Cross multiply
    400.01x = 548.40 × 392.72
  4. Step 4: Simplify right side
    400.01x = 215,366.38
  5. Step 5: Solve for x
    x = 215,366.38/400.01
  6. Step 6: Final answer
    x = 538.41

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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.