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Finding the Fourth Proportional to 456.74, 628.73 and 398.42

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Solution

The fourth proportional to 456.74, 628.73 and 398.42 is: 548.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.74 : 628.73 = 398.42 : x
  2. Step 2: Convert to fraction form
    456.74/628.73 = 398.42/x
  3. Step 3: Cross multiply
    456.74x = 628.73 × 398.42
  4. Step 4: Simplify right side
    456.74x = 250,498.61
  5. Step 5: Solve for x
    x = 250,498.61/456.74
  6. Step 6: Final answer
    x = 548.45

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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.