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Finding the Fourth Proportional to 418.28, 628.64 and 202.01

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Solution

The fourth proportional to 418.28, 628.64 and 202.01 is: 303.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.28 : 628.64 = 202.01 : x
  2. Step 2: Convert to fraction form
    418.28/628.64 = 202.01/x
  3. Step 3: Cross multiply
    418.28x = 628.64 × 202.01
  4. Step 4: Simplify right side
    418.28x = 126,987.41
  5. Step 5: Solve for x
    x = 126,987.41/418.28
  6. Step 6: Final answer
    x = 303.60

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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.