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Finding the Fourth Proportional to 397.51, 548.33 and 287.23

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Solution

The fourth proportional to 397.51, 548.33 and 287.23 is: 396.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.51 : 548.33 = 287.23 : x
  2. Step 2: Convert to fraction form
    397.51/548.33 = 287.23/x
  3. Step 3: Cross multiply
    397.51x = 548.33 × 287.23
  4. Step 4: Simplify right side
    397.51x = 157,495.39
  5. Step 5: Solve for x
    x = 157,495.39/397.51
  6. Step 6: Final answer
    x = 396.20

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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.