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Finding the Fourth Proportional to 418.28, 626.14 and 309.80

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Solution

The fourth proportional to 418.28, 626.14 and 309.80 is: 463.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.28 : 626.14 = 309.80 : x
  2. Step 2: Convert to fraction form
    418.28/626.14 = 309.80/x
  3. Step 3: Cross multiply
    418.28x = 626.14 × 309.80
  4. Step 4: Simplify right side
    418.28x = 193,978.17
  5. Step 5: Solve for x
    x = 193,978.17/418.28
  6. Step 6: Final answer
    x = 463.75

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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.