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Finding the Fourth Proportional to 270.90, 405.72 and 198.90

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Solution

The fourth proportional to 270.90, 405.72 and 198.90 is: 297.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    270.90 : 405.72 = 198.90 : x
  2. Step 2: Convert to fraction form
    270.90/405.72 = 198.90/x
  3. Step 3: Cross multiply
    270.90x = 405.72 × 198.90
  4. Step 4: Simplify right side
    270.90x = 80,697.71
  5. Step 5: Solve for x
    x = 80,697.71/270.90
  6. Step 6: Final answer
    x = 297.89

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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.