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Finding the Fourth Proportional to 418.40, 627.58 and 199.18

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Solution

The fourth proportional to 418.40, 627.58 and 199.18 is: 298.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.40 : 627.58 = 199.18 : x
  2. Step 2: Convert to fraction form
    418.40/627.58 = 199.18/x
  3. Step 3: Cross multiply
    418.40x = 627.58 × 199.18
  4. Step 4: Simplify right side
    418.40x = 124,999.32
  5. Step 5: Solve for x
    x = 124,999.32/418.40
  6. Step 6: Final answer
    x = 298.76

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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.