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Finding the Fourth Proportional to 417.20, 625.75 and 143.25

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Solution

The fourth proportional to 417.20, 625.75 and 143.25 is: 214.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.20 : 625.75 = 143.25 : x
  2. Step 2: Convert to fraction form
    417.20/625.75 = 143.25/x
  3. Step 3: Cross multiply
    417.20x = 625.75 × 143.25
  4. Step 4: Simplify right side
    417.20x = 89,637.97
  5. Step 5: Solve for x
    x = 89,637.97/417.20
  6. Step 6: Final answer
    x = 214.86

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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.