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Finding the Fourth Proportional to 418.27, 627.75 and 345.28

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Solution

The fourth proportional to 418.27, 627.75 and 345.28 is: 518.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.27 : 627.75 = 345.28 : x
  2. Step 2: Convert to fraction form
    418.27/627.75 = 345.28/x
  3. Step 3: Cross multiply
    418.27x = 627.75 × 345.28
  4. Step 4: Simplify right side
    418.27x = 216,749.52
  5. Step 5: Solve for x
    x = 216,749.52/418.27
  6. Step 6: Final answer
    x = 518.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.