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Finding the Fourth Proportional to 418.12, 626.29 and 393.88

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Solution

The fourth proportional to 418.12, 626.29 and 393.88 is: 589.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.12 : 626.29 = 393.88 : x
  2. Step 2: Convert to fraction form
    418.12/626.29 = 393.88/x
  3. Step 3: Cross multiply
    418.12x = 626.29 × 393.88
  4. Step 4: Simplify right side
    418.12x = 246,683.11
  5. Step 5: Solve for x
    x = 246,683.11/418.12
  6. Step 6: Final answer
    x = 589.98

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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.