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Finding the Fourth Proportional to 418.44, 630.84 and 391.68

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Solution

The fourth proportional to 418.44, 630.84 and 391.68 is: 590.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.44 : 630.84 = 391.68 : x
  2. Step 2: Convert to fraction form
    418.44/630.84 = 391.68/x
  3. Step 3: Cross multiply
    418.44x = 630.84 × 391.68
  4. Step 4: Simplify right side
    418.44x = 247,087.41
  5. Step 5: Solve for x
    x = 247,087.41/418.44
  6. Step 6: Final answer
    x = 590.50

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.