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Finding the Fourth Proportional to 418.47, 628.91 and 202.20

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Solution

The fourth proportional to 418.47, 628.91 and 202.20 is: 303.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.47 : 628.91 = 202.20 : x
  2. Step 2: Convert to fraction form
    418.47/628.91 = 202.20/x
  3. Step 3: Cross multiply
    418.47x = 628.91 × 202.20
  4. Step 4: Simplify right side
    418.47x = 127,164.13
  5. Step 5: Solve for x
    x = 127,164.13/418.47
  6. Step 6: Final answer
    x = 303.88

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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.