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Finding the Fourth Proportional to 398.74, 548.73 and 387.46

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Solution

The fourth proportional to 398.74, 548.73 and 387.46 is: 533.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.74 : 548.73 = 387.46 : x
  2. Step 2: Convert to fraction form
    398.74/548.73 = 387.46/x
  3. Step 3: Cross multiply
    398.74x = 548.73 × 387.46
  4. Step 4: Simplify right side
    398.74x = 212,610.93
  5. Step 5: Solve for x
    x = 212,610.93/398.74
  6. Step 6: Final answer
    x = 533.21

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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.